Comments on the Authors' Reply by T. Sok'o\\land T. Lewi\\~nski (2011) to a Discussion by Vazquez and Cervera (2011) on their Research Paper (Sok'o\\land Lewi\\~nski 2010).
Author's reply to a discussion by Gengdong Cheng and Xiaofeng Liu of the review article “On symmetry and non-uniqueness in exact topology optimization” by George I. N. Rozvany (2011, Struct Multidisc Optim 43:297–317).