105 citations · 137 across the 10 of their papers we have counts for
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solv-int1999★ 105 cited
Discrete analogues of the Liouville equation
V. E. Adler, S. Ya. Startsev
The notion of Laplace invariants is transferred to the lattices and discrete equations which are difference analogs of hyperbolic PDE's with two independent variables. The sequence…
solv-int1997
An analog of the variational derivative and constructive necessary integrability condition for hyperbolic equation
S. Ya. Startsev
An algorithm is constructed which allows to express conserved flows of hyperbolic equations in terms of corresponding conserved densities and to eliminate these flows from conserva…
solv-int1995★ 1 cited
Differential substitutions and symmetries of hyperbolic equations
S. Ya. Startsev
There are considered differential substitutions of the form for which there exists a differential operator such that the differe…