Fluctuation-induced first-order transition in $p $-wave superconductors
  The problem of a fluctuation-induced first-order transition is considered for $p $-wave superconductors. Both an $\epsilon$-expansion about $d=4$ and a large-$n$ expansion conclude that the transition for the physical case $n=6$ in $d=3$ is of first order, as in the s-wave case. 
Qi Li, D. Belitz, and John Toner