1. Bakhvalov, N.S.:K optimizacii metodov resheniya kraevykh zacach pri nalichii pogranichnogo sloya. Zh. Vychisl. Mat. Mat. Fiz.9, 841?859 (1969)
2. Boglaev, I.P.: Variacionno-raznostnaya skhema dlya kraevoi zadachi s malym parametrom pri starshei proizvodnoi. Zh. Vychisl. Mat. Mat. Fiz.21, 887?896 (1981)
3. Boglaev, I.P.: Priblizhennoe reshenie nelineinoi kraevoi zadachi s malym parametrom pri starshei proizvodnoi. Zh. Vychisl. Mat. Mat. Fiz.24, 1649?1656 (1984)
4. Bohl, E., Lorenz, J.: Inverse monotonicity and difference schemes of higher order. A summary for two-point boundary value problems. Math. Aequationes19, 1?36 (1979)
5. Bohl, E.: Finite Modelle gewöhnlicher Randwertaufgaben, 1st Ed. Stuttgart: Teubner 1981