@article{RM_1996_51_6_a9,
     author = {E. I. Ganzha and S. P. Tsarev},
     title = {An algebraic formula for superposition and the completeness of the {B\"acklund} transformations of $(2+1)$-dimensional integrable systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1200--1202},
     publisher = {mathdoc},
     volume = {51},
     number = {6},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1996_51_6_a9/}
}