E. R. DomilovskyVant. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki 1983. No.2. С. 19-20.
E. R. Domilovsky, V. N. PiskunovVANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki 1985. No.1. С. 49-52.