1. A. S. Kalitvin and V. A. Kalitvin, Volterra and Volterra-Fredholm Integral Equations with Partial Integrals [in Russian], Lipetsk (2006).
2. A. S. Kalitvin and E. V. Frolova, Linear Equations with Partial Integrals. C-Theory [in Russian], Lipetsk (2004).