TY - BOOK AU - Fhi-Fen, Zhang AU - Wen-Zao, Huang TI - QUALITATIVE THEORY OF DIFFERENTIAL EQUATIONS SN - 0821845519 U1 - 515.35 PY - 1992/// CY - Providence PB - American Mathematical Society KW - Differential Equations--Numerical Solutions N1 - Includes Bibliographical References And Index ER -