Upper critical field H_c2 in Bechgaard salts (TMTSF)_2PF_6
  The symmetry of the superconducting order parameter in Bechgaard salts is still unknown, though the triplet pairing is well stablished by NMR data and large upper critical field. Here we examine the upper critical field of a few candidate superconductors within the standard formalism. The present analysis suggests strongly chiral f-wave superconductor somewhat similar to the one in Sr_2RuO_4 is the most likely candidate. 
A. Dominguez Folgueras and K. Maki