@article {MR3461059, title = {Cyclicity for categorified quantum groups}, journal = {J. Algebra}, volume = {452}, year = {2016}, pages = {118{\textendash}132}, issn = {0021-8693}, doi = {10.1016/j.jalgebra.2015.11.041}, url = {http://dx.doi.org/10.1016/j.jalgebra.2015.11.041}, author = {Beliakova, Anna and Habiro, Kazuo and Lauda, Aaron D. and Webster, Ben} }