共 5 条
[1]
BELLMAN R, 1965, B AM MATH SOC, V71, P495
[3]
MYSKIS AD, 1955, MATEMATICHESKI SBORM, V28, P641
[4]
MYSKIS AD, 1955, MATEMATICHESKI SBORM, V28, P1951
[5]
YORKE JA, 1968, SEMINAR DIFFERENTIAL, P69