On the Reduction of Connection Problems for Differential Equations with an Irregular Singular Point to Ones with Only Regular Singularities, I

Balser W., 1979, Funkcial. Ekvac., 22, 197

Balser W., 1979, Funkcial. Ekvac., 22, 257

Balser W., 1980, Houston J. Math., 6, 149

10.1016/0022-247X(79)90217-8

10.1090/S0002-9947-1909-1500848-5

10.2307/20025482

10.1090/S0002-9947-1913-1500958-3

10.1007/978-3-0348-5956-1

10.1007/978-3-0348-5956-1

Horn J., 1915, Jahresber. d. Deutsch. Math. Ver., 24, 309

Ince E. L., 1956, Ordinary Differential Equations

Jurkat W. B., 1978, Meromorphe Differentialgleichungen, 10.1007/BFb0068236

10.1016/0022-247X(76)90122-0

10.2969/jmsj/01530268

10.1007/BFb0058732

10.1090/S0002-9947-1935-1501779-2

10.1007/BF02392519

10.1090/S0002-9947-1963-0150367-9

Wasow Wolfgang, 1965, Asymptotic expansions for ordinary differential equations