Upper critical field of p-wave superconductors with orthorhombic   symmetry
  We extend the Scharnberg-klemm theory of $H_{c2}$ in p-wave superconductors with broken symmetry to cases of partially broken symmetry in an orthorhombic crystal, as is appropriate for the more exotic ferromagnetic superconductor UCoGe in strong applied magnetic fields. For some partially broken symmetry cases, $H_{c2}$ can mimic upward curvature in all three crystal axis directions, and reasonably good fits to some of the the low-field UCoGe data are obtained. 
Christopher L\"orscher, Richard A. Klemm, Jingchuan Zhang, and Qiang   Gu
cond-mat.supr-con cond-mat.str-el