5XIN H ,ZHOU H, BUNDY D S. Comparsion of energy use and piglet performance between conventional and energy - efficient heat lamps [ J]. Applied Engineering in Agriculture, 1997,13 : 1 ;95 - 99.
9C. Farmer,S. Robert and Y. Choiniere.Reducing ambient temperature in farrowing houses with a new controlled-environment system[].Canada Journal of Animal Science.1998