as on urgent basis. vs an urgent basis.

Some examples from the web:

• The EESC considers that import quotas for the Balkans should be established on an urgent basis.
• This would complement other NATO reaction forces already in existence and be a real incentive for NATO allies other than just the Americans and British to provide a small number of highly-trained and well-equipped forces ready to take on urgent tasks on a global basis.
• On 28 February 2007, the Commission issued a reasoned opinion on an urgent basis requesting Poland to comply with EC environmental law within a week.
• The Commission is committed to maintain or restore stocks to levels that can produce the maximum sustainable yield with the aim of achieving these goals for depleted stocks on an urgent basis and where possible not later than 2015.
• In accordance with, Article 77 of the Italian Constitution, the Decree-Laws were adopted on an urgent basis and immediately published in the Gazzetta ufficiale della Repubblica italiana, entering into force on their respective dates of publication4.
• And what action has been undertaken or is to be undertaken on an urgent basis to make sure that any goods entering and subsequently sold in the EU carry a clear label showing the country of manufacture?
• The other law referred to in Article 5 as a legal basis for the granting of various forms of aid is Law No 252/91 amending Law No 87/90 on urgent animal husbandry measures.
• Urgent measures need to be taken at EU level to preserve sheep and goat farming on an economically sustainable basis.
• It is urgent to get the new protocol into operation and the Parliament should act in this regard without delay using the proposed legal basis.
• There is an urgent need to provide the same access to space-based intelligence systems for all Member States on a common basis.
• Mr. Miyawaki was called on urgent business.
• I am therefore delighted to see this Parliament concerning itself with the creation of a framework for rural living, enabling the Commission to put forward a social and economic model which can be used to tackle an urgent problem in time and on a rational basis.
• Finally, I should like to make an urgent appeal to the Commission not to resort to legal action again on account of the legal basis.
• Remaining in Paris on urgent business regarding my art foundation.
• Therefore, the agreement contains explicit provisions on urgent procedure, including possible action by the committee responsible.
• The Council may decide to take decisions by correspondence on urgent matters.
• Tom has gone to Boston on urgent business.
• We must insist on urgent implementation of this Community assistance.
• (Parliament adopted the resolution) That concludes the vote on urgent subjects.
• I'm here on urgent business for the Queen Mother.

Some examples from the web:

• The EESC considers that import quotas for the Balkans should be established on an urgent basis.
• On 28 February 2007, the Commission issued a reasoned opinion on an urgent basis requesting Poland to comply with EC environmental law within a week.
• The Commission is committed to maintain or restore stocks to levels that can produce the maximum sustainable yield with the aim of achieving these goals for depleted stocks on an urgent basis and where possible not later than 2015.
• In accordance with, Article 77 of the Italian Constitution, the Decree-Laws were adopted on an urgent basis and immediately published in the Gazzetta ufficiale della Repubblica italiana, entering into force on their respective dates of publication4.
• There is an urgent need to provide the same access to space-based intelligence systems for all Member States on a common basis.
• And what action has been undertaken or is to be undertaken on an urgent basis to make sure that any goods entering and subsequently sold in the EU carry a clear label showing the country of manufacture?
• I am therefore delighted to see this Parliament concerning itself with the creation of a framework for rural living, enabling the Commission to put forward a social and economic model which can be used to tackle an urgent problem in time and on a rational basis.
• Finally, I should like to make an urgent appeal to the Commission not to resort to legal action again on account of the legal basis.
• The introduction of a new system working on the basis of encrypted e-mails is an urgent necessity.
• The application for authorisation is to be considered in camera, on the basis of an urgent procedure.
• An urgent debate may be held without a report or, exceptionally, on the basis of an oral report by the committee responsible.
• There is an urgent need to create a network of national cancer registers to cover the entire enlarged Europe so as to obtain conclusive and comparable data as a basis for research.
• On the basis of this, what paragraph 2 calls 'tackling the demographic problem faced by the majority of the Member States' is an urgent matter.
• - an urgent need on the part of the Commission for a more detailed scientific basis for managing a serious risk to human or animal health or the environment.
• There is an urgent need for the EU to give greater support to local initiatives to ensure that forests are managed on a sustainable and environmentally acceptable basis which takes due account of human rights.
• Where an urgent adoption of the position is necessary, and on the basis of a proposal by its chairman, the coordination group may agree to a shorter deadline.
• This high level of participation demonstrates the appeal of the European Research Council and confirms that funding for frontier research on a bottom-up basis corresponds to an urgent need in Europe.
• The Court of Justice shall give a ruling on the questions which are subject to review by means of an urgent procedure on the basis of the file forwarded to it by the General Court.
• There is an urgent need for a third-party monitoring system to be appointed in an effort firstly to end the violence which is taking place now on a daily basis, and secondly to resume peace talks.
• 5. An urgent debate may be held without a report or, exceptionally, on the basis of an oral report by the committee responsible.