R-mode instability of strange stars and observations of neutron stars in   LMXBs
  Using a realistic equation of state (EOS) of strange quark matter, namely, the modified bag model, and considering the constraints to the parameters of EOS by the observational mass limit of neutron stars, we study the r-mode instability window of strange stars, and find the same result as the brief study of Haskell, Degenaar and Ho in 2012 that these instability windows are not consistent with the spin frequency and temperature observations of neutron stars in LMXBs. 
Chun-Mei PI, Shu-Hua Yang, and Xiao-Ping Zheng
astro-ph.HE nucl-th