Linear Ordinary Differential Equations: Basic Facts and Infinitesimal Neighborhoods at an Irregular Singular Point
1983 ◽
Vol 23
(4)
◽
pp. 23-35
1971 ◽
Vol 40
(0)
◽
pp. 11-62
◽
1994 ◽
Vol 109
(1)
◽
pp. 201-221
◽
1971 ◽
Vol 11
(1)
◽
pp. 363-367
◽
1969 ◽
Vol 82
(1)
◽
pp. 189-256
◽
1984 ◽
Vol 15
(2)
◽
pp. 253-271
◽
1965 ◽
Vol 35
(0)
◽
pp. 1-30
◽