Transformations for hypersurfaces with vanishing Gauss-Kronecker curvature. Corro, A.V.; Ferreira, W.; Tenenblat, K. — 2005 Beiträge zur Algebra und Geometrie
Backlund Transformations for a Class of Systems of Differential Equation. P.T. Campos; K. Tenenblat — 1994 Geometric and functional analysis