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- [3] INTEGRAL SOLUTIONS OF THE EQUATION F(X,Y)ALPHA=P(X)G(X,Y) COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1992, 315 (09): : 963 - 968
- [7] A SUFFICIENT NONOSCILLATORY CONDITION FOR SOLUTIONS OF THE EQUATION Y''+F(X)Y=O DOKLADY AKADEMII NAUK SSSR, 1956, 110 (06): : 929 - 931
- [8] PHASE PORTRAIT OF THE SYSTEM X=Y, Y=F(X,Y) BOLLETTINO DELLA UNIONE MATEMATICA ITALIANA, 1990, 4B (02): : 265 - 274