共 8 条
[1]
Coddington EA, 1955, THEORY ORDINARY DIFF
[3]
Dubrovin B. A., 1976, RUSSIAN MATH SURVEYS, V31, P59, DOI [10.1070/RM1976v031n01ABEH001446, DOI 10.1070/RM1976V031N01ABEH001446]
[4]
DUBROVIN BA, 1976, USP MAT NAUK, V31, P55
[5]
Its AR, 1975, FUNCTIONAL ANAL APPL, V9, P65, DOI [10.1007/BF01078185, DOI 10.1007/BF01078187]
[6]
LEVINSON N, 1949, MATH TIDSKR, V4, P25
[7]
Magnus W., 1966, HILLS EQUATION