@article{ZVMMF_1965_5_4_a6,
     author = {Van Tun},
     title = {A theory of the thermal potential. {III.~Smoothness} of a plane thermal potential},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {658--666},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1965_5_4_a6/}
}