@article{Birch1968, author = {H. G. Birch}, title = {Field Measurement in Nutrition, Learning, and Behavior}, journal = {N. S. Scrimshaw and J. E. Gordon (Eds.), Malnutrition, Learning, and Behavior, Cambridge (The M.I.T. Press) 1968, pp. 497-507.}, year = {1968}, }