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- [1] Long time existence of solutions for partial 2/ partial t2u(x,t) + $PTL/ partial tα(u(x,t)) = partial 2/ partial x2β(u(x,t)) Computers & Mathematics with Applications, 1991, 21 (05):
- [4] BEHAVIOR OF SOLUTIONS OF X'' + Q(T)F(X) = R(T) ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI RENDICONTI-CLASSE DI SCIENZE FISICHE-MATEMATICHE & NATURALI, 1973, 54 (04): : 544 - 550