Lower limits on the maximum orbital frequency around rotating strange stars D. Gondek-Rosińska, N. Stergioulas, T. Bulik, W. Kluźniak and E. Gourgoulhon A&A, 380 1 (2001) 190-197 Published online: 15 December 2001 DOI: 10.1051/0004-6361:20011328