Pion condensation of quark matter in a static Einstein universe D. Ebert, K. G. Klimenko, A. V. Tyukov and V. C. Zhukovsky Eur. Phys. J. C, 58 1 (2008) 57-68 Published online: 24 September 2008 DOI: 10.1140/epjc/s10052-008-0667-6