-trivial deformations of -modules of symbols.
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Ben Ammar, Mabrouk, Boujelbene, Maha (2008)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Borowiec, Andrzej, Pachol, Anna (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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