TY - JOUR AU - Goldman, B D TI - Mammalian photoperiodic system: formal properties and neuroendocrine mechanisms of photoperiodic time measurement JO - J Biol Rhythms IS - 04 VL - 16 PY - 2001 DO - 10.1177/074873001129001980 L3 - PubMed-ID: 11506375 SP - 283 EP - 301 ER -