Korsun L D

Publications in Math-Net.Ru

1. The stationary perturbation theory in case of a potential-series
   
   PFMT, 2011, no. 1(6),  29–35
2. Variational perturbation theory. $\varphi^{2k}$ oscillator
   
   TMF, 90:1 (1992),  37–54