Tsygan, B. L., and D. Tamarkin. “Noncommutative Differential Calculus, Homotopy BV Algebras and Formality Conjectures”. Methods of Functional Analysis and Topology 6, no. 2 (June 25, 2000): 85–100. Accessed February 4, 2026. https://zen.imath.kiev.ua/index.php/mfat/article/view/121.