@article{GFA_1994__4_6_58164,
     author = {P.T. Campos and K. Tenenblat},
     title = {Backlund {Transformations} for a {Class} of {Systems} of {Differential} {Equation.}},
     journal = {Geometric and functional analysis},
     pages = {270--287},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1994},
     zbl = {0805.35112},
     url = {http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58164/}
}