共 9 条
[1]
ATKINSON FV, 1955, PAC J MATH, V5, P643
[2]
BAKER JG, TO BE PUBLISHED
[3]
Belohorec S., 1961, MAT FYZ CASOPIS SLOV, V11, P250
[5]
BOBISUD LE, 1970, SIAM J MATH ANAL, V18, P601
[6]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[8]
LANGENHOP CE, 1960, P AMS, V11, P795
[9]
YOSHIZAWA T, 1970, TOHUKA MATH J, V22, P619