Geodesic
O Shodimosti Raznostnyh Shem Dlya Uravneniya $-delta U+cu=f$ na Obobwennyh Resheniyah iz $w_{2,*}^s(-infty s +infty)$
Publications de l'Institut Mathématique, _N_S_37 (1985) no. 51, p. 129 
Boško Jovanović; Lav Ivanović; E. Šili. O Shodimosti Raznostnyh Shem Dlya Uravneniya $-delta U+cu=f$ na Obobwennyh Resheniyah iz $w_{2,*}^s(-infty s +infty)$. Publications de l'Institut Mathématique, _N_S_37 (1985) no. 51, p. 129 . http://geodesic.mathdoc.fr/item/PIM_1985_N_S_37_51_a22/
@article{PIM_1985_N_S_37_51_a22,
     author = {Bo\v{s}ko Jovanovi\'c and Lav Ivanovi\'c and E. \v{S}ili},
     title = {O {Shodimosti} {Raznostnyh} {Shem} {Dlya} {Uravneniya} $-delta U+cu=f$ na {Obobwennyh} {Resheniyah} iz $w_{2,*}^s(-infty s +infty)$},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {129 },
     year = {1985},
     volume = {_N_S_37},
     number = {51},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1985_N_S_37_51_a22/}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Issleduetsya shodimost' raznostnyh shem, approksimiruyushchih uravnenie $-\Delta u+cu=f,\, c$ usloviyami periodichnosti. Pokazano, chto obychnaya shema ``krest'' s usrednennoi chas'yu, shoditsya v diskretnoi $W_{2^*}^m$-norme so skorost'yu $O(h^\alpha)$, esli reshenie ishodnoi zadachi prinadlezhit periodicheskomu prostranstvu Soboleva--Slobodeckogo $W_{2,^*}^{m+\alpha}$ ($m=0, \pm 1, \pm 2,\ldots$; $0\alpha\leq 2$).