Functions of noncommuting operators in an asymptotic problem for a 2D   wave equation with variable velocity and localized right-hand side
  We use the theory of functions of noncommuting operators (noncommutative analysis) to solve an asymptotic problem for a partial differential equation and show how, starting from general constructions and operator formulas that seem to be rather abstract from the viewpoint of differential equations, one can end up with very specific, easy-to-evaluate expressions for the solution, useful, e.g., in the tsunami wave problem. 
S. Dobrokhotov (1 and 2), D. Minenkov (1 and 2), V. Nazaikinskii (1   and 2), B. Tirozzi (3) ((1) Institute for Problems in ...
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