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- [3] NOTE ON EQUATION Y'''+''-LAMBDA-2Y'2=0 ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1970, 50 (08): : 497 - +
- [9] FUNCTIONS SATISFYING DIFFERENTIAL EQUATION X2Y'''+3XY''++Y'+X2Y=0 DOKLADY AKADEMII NAUK SSSR, 1962, 144 (01): : 56 - &