@article{TMF_2005_145_2_a2,
     author = {R. Beals and E. A. Kartashova},
     title = {Constructively {Factoring} {Linear} {Partial} {Differential} {Operators} in {Two} {Variables}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {165--180},
     year = {2005},
     volume = {145},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2005_145_2_a2/}
}