Voir la notice de l'article provenant de la source Math-Net.Ru
[1] Bobochko V. N., “Differentsialnaya tochka povorota v teorii singulyarnykh vozmuschenii, I”, Izv. vuzov. Matematika, 2002, no. 3, 3–14 | MR | Zbl
[2] Bobochko V. N., “Uravnenie tipa Orra–Zommerfelda s dvumya tochkami povorota”, Differents. uravneniya, 28:10 (1992), 1559–1570 | MR
[3] Bobochko V. N., “Vnutrennyaya tochka povorota v teorii singulyarnykh vozmuschenii”, Ukr. matem. zhurn., 48:7 (1996), 876–890 | MR | Zbl
[4] Bobochko V. N., Sistema differentsialnykh uravnenii s nestabilnoi tochkoi povorota, Dep. v VINITI 07.02.97, No 366-B97, Red. zhurn. “Izv. vuzov. Matematika”, Kazan, 1997, 23 pp.
[5] Bobochko V. N., “Kraevaya zadacha dlya sistemy singulyarno vozmuschennykh differentsialnykh uravnenii s nediagonaliziruemym predelnym operatorom”, Izv. vuzov. Matematika, 1999, no. 4, 14–23 | MR | Zbl
[6] Dorodnitsyn A. A., “Asimptoticheskie zakony raspredeleniya sobstvennykh znachenii dlya nekotorykh osobykh vidov differentsialnykh uravnenii vtorogo poryadka”, UMN, 7:6 (1952), 3–96
[7] Lomov S. A., Vvedenie v obschuyu teoriyu singulyarnykh vozmuschenii, Nauka, M., 1981, 400 pp. | MR
[8] Langer R., “On the asymptotic forms of ordinary linear differential equations of the third order in a region containing a turning point”, Trans. Amer. Math. Soc., 80 (1955), 93–123 | DOI | MR | Zbl