Photoperiodic control of circadian activity rhythms in diurnal rodents, K. R. Kramm, Deborah A. Kramm
Michigan Tech Publications

The influence of environmental temperature and photoperiod on activity in the red squirrel, Tamiasciurus hudsonicus, B. R. Bahnak, K. R. Kramm
Michigan Tech Publications

Phase control of circadian activity rhythms in ground squirrels, K. R. Kramm
Michigan Tech Publications