Formal Lagrangian Operad by Alberto S. Cattaneo, Benoit Dherin, Giovanni Felder

“…If M is also a symplectic groupoid, then its multiplication space is an associative product in this operad. Following this idea, we provide a deformation theory for symplectic groupoids analog to the deformation theory of algebras. …”
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Plethysm Products, Element– and Plus Constructions by Kaufmann, Ralph M., Monaco, Michael

“…Specializing the results on the third level yields a criterion for when a definition of operad–like structure as a plethysm monoid —as exemplified by operads— is possible.…”
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