Upper critical fields and superconducting anisotropy of K0.70Fe1.55Se1.01S0.99 and K0.76Fe1.61Se0.96S1.04 single crystalsHechang Lei and C. PetrovicEPL, 95 5 (2011) 57006DOI: https://doi.org/10.1209/0295-5075/95/57006