Versal deformation theory of algebras over a quadratic operad
  We develop deformation theory of algebras over quadratic operads where the parameter space is a commutative local algebra. We also give a construction of a distinguised deformation of an algebra over a quadratic operad with a complete local algebra as its base--the so called `versal deformation'--which induces all other deformations of the given algebra. 
Alice Fialowski, Goutam Mukherjee and Anita Naolekar
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