X(3872) and other possible heavy molecular states Xiang Liu, Zhi-Gang Luo, Yan-Rui Liu and Shi-Lin Zhu Eur. Phys. J. C, 61 3 (2009) 411-428 Published online: 08 April 2009 DOI: 10.1140/epjc/s10052-009-1020-4