Linearizability of Nonlinear Equations on a Quad-Graph by a Point, Two   Points and Generalized Hopf-Cole Transformations
  In this paper we propose some linearizability tests of partial difference equations on a quad-graph given by one point, two points and generalized Hopf-Cole transformations. We apply the so obtained tests to a set of nontrivial examples. 
Decio Levi and Christian Scimiterna
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