@article{SEMR_2017_14_a123,
     author = {S. P. Tsarev and V. A. Stepanenko},
     title = {On weakly commutative triples of partial differential operators},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1050--1063},
     publisher = {mathdoc},
     volume = {14},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2017_14_a123/}
}