Voir la notice de l'article provenant de la source Math-Net.Ru
[1] Fedoryuk M. V., Tr. MMO, 15, URSS, M., 1966, 296–345 | MR
[2] Sultanaev Ya. T., Tr. sem. im. I. G. Petrovskogo, no. 13, Izd-vo Mosk. un-ta, M., 1988, 36–55
[3] Naimark M. A., Lineinye differentsialnye operatory, Nauka, M., 1969
[4] Eastham M. S. P., Grudniewicz C. G. M., J. London Math. Soc. Ser. 2, 24:2 (1981), 256–271 | MR
[5] Grudniewicz C. G. M., Proc. Roy. Soc. Edinb. Sec. A, 87 (1980), 53–63 | MR | Zbl
[6] Anikeeva L. I., UMN, 32:2 (1977), 179–180 | MR | Zbl
[7] Anikeeva L. I., Vestn. MGU. Ser. 1. Matem., mekh., 1976, no. 6, 44–52 | MR | Zbl
[8] Fedoryuk M. V., Asimptoticheskie metody dlya lineinykh obyknovennykh differentsialnykh uravnenii, Nauka, M., 1983 | Zbl