Compressed Conjugacy and the Word Problem for Outer Automorphism Groups of Graph Groups. - Niko Haubold; Markus Lohrey; Christian Mathissen (Developments in Language Theory, 2010)

Compressed Word Problems in HNN-extensions and Amalgamated Products. - Niko Haubold; Markus Lohrey (Theory Comput. Syst., 2011)

Compressed Decision Problems for Graph Products and Applications to (outer) Automorphism Groups. - Niko Haubold; Markus Lohrey; Christian Mathissen (Int. J. Algebra Comput., 2012)