共 21 条
[1]
BELLMAN R, 1947, T AM MATH SOC, V62, P257
[2]
BENZAID Z, 1987, STUD APPL MATH, V77, P197
[3]
Coffman C, 1964, T AM MATH SOC, V110, P22
[5]
EVGRAFOV MA, 1958, DOKL AKAD NAUK SSSR+, V121, P26
[6]
KHOAN NT, 1981, DIFF URAVN, V17, P624
[7]
KHOAN NT, 1988, DIFF EQUAT, V17, P424