@article{ISU_2018_18_3_a4,
     author = {I. S. Mokrousov},
     title = {Criterion for a generalized solution in the class $L_p$ for the wave equation to be in the class $W^l_p$},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {297--304},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2018_18_3_a4/}
}