@article{TMF_1986_66_1_a3,
     author = {A. V. Mikhailov and A. B. Shabat},
     title = {Integrability conditions for systems of two equations of the form 
},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {47--65},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1986_66_1_a3/}
}