@article{DAN_1989_304_2_a17,
     author = {W. I. Fushchych and A. G. Nikitin},
     title = {New systems and conservation laws of equations for elastic waves},
     journal = {Doklady Akademii Nauk},
     pages = {333--335},
     publisher = {mathdoc},
     volume = {304},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a17/}
}