The correlations between the spin frequencies and kHz QPOs of neutron stars in LMXBs H. X. Yin, C. M. Zhang, Y. H. Zhao, Y. J. Lei, J. L. Qu, L. M. Song and F. Zhang A&A, 471 2 (2007) 381-384 Published online: 18 June 2007 DOI: 10.1051/0004-6361:20077069