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Variational methods, for boundary value problems, for systems of elliptic equations by Mikhail Alekseevich Lavrentev,  1963
Matematika i mekhanika: Izbrannye trudy (Russian Edition) by Mikhail Alekseevich Lavrentev,  1990
Some Problems of Mathematics and Mechanics (American Mathematical Society Translations--Series 2) by L.V. Ahlfors, S.N. Antoncev, et all  1976-12-31
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