@article{MZM_1993_53_4_a2,
     author = {P. M. Gauthier and P. V. Paramonov},
     title = {Approximation by harmonic functions in the $C^1$-norm and harmonic $C^1$-content of compact subsets in $\mathbb R^n$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {21--30},
     publisher = {mathdoc},
     volume = {53},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_4_a2/}
}