Geodesic
Elliptic boundary value problems with nonvariational perturbation and the finite element method
Applications of Mathematics, Tome 18 (1973) no. 6, pp. 422-433.

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This article deals with the estimate of exactness of finite element method which is applied to homogeneous non-elliptic boundary value problem. It is supposed that the respective differential operator of the problem is a sum of elliptic and a "perturbed" operator. A sufficient condition for this "perturbed" operator is given in order that the convergency of finite element method may be maintained.
DOI : 10.21136/AM.1973.103498
Classification : 35A35, 35B20, 35J40, 65N10 
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     title = {Elliptic boundary value problems with nonvariational perturbation and the finite element method},
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Janovský, Vladimír. Elliptic boundary value problems with nonvariational perturbation and the finite element method. Applications of Mathematics, Tome 18 (1973) no. 6, pp. 422-433. doi : 10.21136/AM.1973.103498. http://geodesic.mathdoc.fr/articles/10.21136/AM.1973.103498/

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