Bringmann, Karl Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Ikenmeyer, Christian Algorithms and Complexity, MPI for Informatics, Max Planck Society;
https://eccc.weizmann.ac.il/report/2017/034/ (Any fulltext)
Bringmann, K., Ikenmeyer, C., & Zuiddam, J. (2017). On Algebraic Branching Programs of Small Width. Electronic Colloquium on Computational Complexity (ECCC): Report Series, 34 (Revision 1), 1-30.