@article{RM_2005_60_1_a6,
     author = {O. I. Bogoyavlenskii},
     title = {Necessary conditions for the~decoupling of systems {of~PDEs} of~arbitrary order},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {159--160},
     publisher = {mathdoc},
     volume = {60},
     number = {1},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2005_60_1_a6/}
}