共 35 条
[2]
Atkinson FV., 1964, DISCRETE CONTINUOUS
[3]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[4]
COPPEL W, 1955, LECTURE NOTES MATH
[9]
ELIAS U, ARCH RATIONAL MECH A
[10]
Gantmakher F, 1936, CR ACAD SCI URSS, V10, P3