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- [22] ISOCHRONISM PROBLEMS FOR NONLINEAR 2ND ORDER DIFFERENTIAL-EQUATIONS PUBLICATIONES MATHEMATICAE-DEBRECEN, 1987, 34 (3-4): : 163 - 167
- [23] 2ND ORDER ABSTRACT DIFFERENTIAL-EQUATIONS WITH SINGULAR COEFFICIENTS ANNALI DI MATEMATICA PURA ED APPLICATA, 1982, 130 : 257 - 286
- [29] BLOCK HOPSCOTCH PROCEDURES FOR 2ND ORDER PARABOLIC DIFFERENTIAL-EQUATIONS JOURNAL OF THE INSTITUTE OF MATHEMATICS AND ITS APPLICATIONS, 1977, 19 (02): : 205 - 216