@article{SM_1992_73_1_a6,
     author = {K. Yu. Osipenko},
     title = {Best and optimal recovery methods for classes of harmonic functions},
     journal = {Sbornik. Mathematics},
     pages = {111--133},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1992_73_1_a6/}
}