Artikel 33

1. If the person concerned does not, at a given date, satisfy the conditions required by the legislation of all the Contracting Parties concerned, regard being had to the provisions of Article 28, but satisfies the conditions of the legislation of only one or more of them, the following provisions shall apply:
(a) the amount of the benefits payable shall be calculated in accordance with the provisions of paragraphs 2 to 4 or of paragraph 5 of Article 29, as appropriate, by each of the competent institutions applying legislation the conditions of which are fulfilled;
(b) however, (i) if the person concerned satisfies the conditions of at least two legislations, without any need to include periods of insurance or residence completed under legislations the conditions of which are not fulfilled, such periods shall not be taken into account for the purpose of applying the provisions of Article 29, paragraphs 2 to 4;
(ii) if the person concerned satisfies the conditions of one legislation only, without any need to invoke the provisions of Article 28, the amount of the benefit payable shall be calculated exclusively in accordance with the provisions of the legislation the conditions of which are fulfilled, taking account of periods completed under that legislation only.
(i) if the person concerned satisfies the conditions of at least two legislations, without any need to include periods of insurance or residence completed under legislations the conditions of which are not fulfilled, such periods shall not be taken into account for the purpose of applying the provisions of Article 29, paragraphs 2 to 4;
(ii) if the person concerned satisfies the conditions of one legislation only, without any need to invoke the provisions of Article 28, the amount of the benefit payable shall be calculated exclusively in accordance with the provisions of the legislation the conditions of which are fulfilled, taking account of periods completed under that legislation only.
2. Benefits awarded under one or more of the legislations concerned in the case covered by the preceding paragraph shall be recalculated ex officio, in accordance with the provisions of paragraphs 2 to 4 or of paragraph 5 of Article 29, as appropriate, as and when the conditions prescribed by the other legislation or legislations concerned are satisfied, regard being had, where appropriate, to the provisions of Article 28.
3. Benefits awarded under the legislation of two or more Contracting Parties shall be recalculated, in accordance with the provisions of paragraph 1 of this Article, at the request of the beneficiary, when the conditions prescribed by one or more of the legislations concerned cease to be fulfilled.