Progress of Theoretical Physics Vol. 57 No. 3 (1977) pp. 797-807 Nonlinear Evolution Equations Generated from the Bäcklund Transformation for the Boussinesq Equation Ryogo Hirota and Junkichi Satsuma Progress of Theoretical Physics Supplement No.59 (1976) pp. 64-100 A Variety of Nonlinear Network Equations Generated from the Bäcklund Transformation for the Toda Lattice Ryogo Hirota and Junkichi Satsuma
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