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Numdam - Search Journals Seminars Conferences Books Lecture notes Theses Authors NOT Between and Author All Author Title Date References Mots-cles Full text Toggle filters Years 2009 (1) Collections Annales de l'Institut Fourier (1) Document types Journal article (1) Classifications 35A17 (1) 35A20 (1) 35A27 (1) 35H10 (1) 35H20 (1) 1 result A New Proof of Okajis Theorem for a Class of Sum of Squares Operators Cordaro, Paulo D.; Hanges, Nicholas Annales de l'Institut Fourier, Volume 59 (2009) p. 595-619 About Help Legal notice Contact Published by Supported by Partner of