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- [8] ON GEOMETRY INDUCED ON SOLUTIONS OF 3RD ORDER PARTIAL-DIFFERENTIAL EQUATION VESTNIK MOSKOVSKOGO UNIVERSITETA SERIYA 1 MATEMATIKA MEKHANIKA, 1991, (02): : 80 - 82
- [9] On a criterion for oscillatory solutions of a linear differential equation of the second order PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1940, 36 : 283 - 287
- [10] OSCILLATION OF SOLUTIONS OF LINEAR DIFFERENTIAL EQUATIONS OF THE 3RD AND 4TH ORDER DOKLADY AKADEMII NAUK SSSR, 1958, 118 (01): : 22 - 24