Geodesic
The approximation 2D~elliptic and parabolic equations on the pair connected irregular grids
Matematičeskoe modelirovanie, Tome 6 (1994) no. 4, pp. 53-64.

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The approximation of 2D elliptic and parabolic equations on pair connected irregular grids is considered. Grid points are apexes of arbitrary convex poligons. The poligons can be differed by number of apexes. The convergence of difference schemes is proved. 
@article{MM_1994_6_4_a5,
     author = {I. V. Fryazinov},
     title = {The approximation {2D~elliptic} and parabolic equations on the pair connected irregular grids},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {53--64},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1994_6_4_a5/}
}
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I. V. Fryazinov. The approximation 2D~elliptic and parabolic equations on the pair connected irregular grids. Matematičeskoe modelirovanie, Tome 6 (1994) no. 4, pp. 53-64. http://geodesic.mathdoc.fr/item/MM_1994_6_4_a5/