117 citations · 882 across the 65 of their papers we have counts for
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math.AP2008★ 21 cited
Singular reduction operators in two dimensions
Michael Kunzinger, Roman O. Popovych
The notion of singular reduction operators, i.e., of singular operators of nonclassical (conditional) symmetry, of partial differential equations in two independent variables is in…
math-ph2008★ 14 cited
Potential Conservation Laws
Michael Kunzinger, Roman O. Popovych
We prove that potential conservation laws have characteristics depending only on local variables if and only if they are induced by local conservation laws. Therefore, characterist…