Deforming the Lie Superalgebra of Contact Vector Fields on $S^{1|1}$
  We classify nontrivial deformations of the standard embedding of the Lie superalgebra K(1) of contact vector fields on the (1,1)-dimensional supercircle into the Lie superalgebra of superpseudodifferential operators on the supercircle. This approach leads to the deformations of the central charge induced on K(1) by the canonical central extension of $S\Psi DO$. 
Boujemaa Agrebaoui, Nizar Ben Fraj, Salem Omri