Kaufmann, Ralph M. Max Planck Institute for Mathematics, Max Planck Society;
kaufmann_drinfeld_oa_2009.pdf (Any fulltext), 322KB
Kaufmann, R. M., & Pham, D. (2009). The Drinfelʹd double and twisting in stringy orbifold theory. International Journal of Mathematics, 20(5), 623-657. doi:10.1142/S0129167X09005431.