Freer et al., 1962. Brit. J. Nutr., 16: 279-295

Freer, M. ; Campling, R. C. ; Balch, C. C., 1962. Factors affecting the voluntary intake of food by cows. 4. The behaviour and reticular motility of cows receiving diets of hay, oat straw and oat straw with urea. Br. J. Nutr., 16: 279-295