共 33 条
[11]
HETHCOTE H W, 1976, Mathematical Biosciences, V28, P335, DOI 10.1016/0025-5564(76)90132-2
[16]
Hethcote HW, 1981, DIFF EQUAT, P65
[17]
HETHCOTE HW, 1984, SPRINGER VERLAG LECT, V56
[19]
HOPPENSTEADT G, 1975, MATH THEORIES POPULA