Quark and pion condensation in a chromomagnetic background field D. Ebert, K.G. Klimenko, V.C. Zhukovsky and A.M. Fedotov Eur. Phys. J. C, 49 3 (2007) 709-719 Published online: 19 December 2006 DOI: 10.1140/epjc/s10052-006-0143-0