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- [2] PERIODIC SOLUTIONS OF NON-LINEAR ELLIPTICAL DIFFERENTIAL EQUATIONS JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1968, 232 : 156 - &
- [3] PERIODIC SOLUTIONS OF SOME NON-LINEAR DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1967, 172 (05): : 1003 - &
- [4] DETERMINATION OF PERIODIC SOLUTIONS FOR CERTAIN NON-LINEAR DIFFERENTIAL EQUATIONS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1969, 268 (22): : 1345 - &
- [5] ON PERIODIC SOLUTIONS OF NON-LINEAR DIFFERENTIAL-DIFFERENCE EQUATIONS BULLETIN DE L ACADEMIE POLONAISE DES SCIENCES-SERIE DES SCIENCES MATHEMATIQUES ASTRONOMIQUES ET PHYSIQUES, 1968, 16 (07): : 577 - &
- [6] The periodic solutions of non-linear differential equations of the parabolic type COMPTES RENDUS DE L ACADEMIE DES SCIENCES DE L URSS, 1939, 25 : 3 - 6
- [8] The periodic solutions to non-linear differential equations of the parabolic type COMPTES RENDUS DE L ACADEMIE DES SCIENCES DE L URSS, 1940, 28 : 403 - 406
- [9] INTEGRAL EQUATIONS AND PERIODIC SOLUTIONS OF NON-LINEAR DIFFERENTIAL SYSTEMS BULLETIN DE LA CLASSE DES SCIENCES ACADEMIE ROYALE DE BELGIQUE, 1969, 55 (10): : 934 - &
- [10] UNIQUENESS OF SOLUTIONS OF A NON-LINEAR SYSTEM OF DIFFERENTIAL EQUATIONS PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES, 1962, 32 : 187 - &