References
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- Bicadze , A. and Samarski , A. 1969 . Of some simpler generalization of linear eliptic boundary value problems . DAN SSSR , 185 ( 4 ) : 739 – 740 . in Russian
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- Adžić , N. 1990 . On the spectral approximation for boundary value problems . Proceedings of VIA Conference in Appl Math. . 1990 . pp. 1 – 11 . Y U-Osijek
- Adžić N. On the spectral approximation for singularly perturbed problems 4/5/6 ZAMM 71 isue , (to appear