Author:
Shkil’ N. I.,Zavizion G. V.
Reference2 articles.
1. A. M. Samoilenko, M. I. Shkil’, and V. P. Yakovets’, Linear Systems of Differential Equations with Degeneracy (Vyshcha Shkola, Kiev, 2000) [in Ukrainian].
2. A.-M. Wazwaz, J. Comput. Appl. Math. 34(1), 65 (1991).