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- [2] A BOUNDEDNESS THEOREM FOR NON-LINEAR DIFFERENTIAL EQUATIONS OF THE 2ND ORDER PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1951, 47 (01): : 49 - 54
- [6] SECONDARY CONDITIONS FOR LINEAR DIFFERENTIAL OPERATORS OF THE 2ND ORDER JOURNAL OF MATHEMATICS AND MECHANICS, 1957, 6 (02): : 247 - 285
- [7] NON-LINEAR FLUXES AND 2ND ORDER COEFFICIENTS INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY, 1982, 21 (09): : 859 - 863
- [9] SOLUTIONS OF 2ND ORDER NON-LINEAR DIFFERENTIAL EQUATIONS WITH SLOWLY VARYING COEFFICIENTS DOKLADY AKADEMII NAUK SSSR, 1957, 114 (06): : 1149 - 1152