Healy, S.D. & Krebs, J.R. 1996. Food storing and the hippocampus in Paridae. Brain Behavior and Evolution 47 (4): 195-199.
Healy, S.D. 1995. Memory for objects and positions: Delayed non-matching to sample in storing and nonstoring tits. Quarterly Journal of Experimental Psychology: Section B Comparative and Physiological Psychology 48 (2): 179-191.
Healy, S.D. & Krebs, J.R. 1992. Food storing and the hippocampus in corvids: Amount and volume are correlated. Proceedings of the Royal Society of London Series B: Biological Sciences 248 (1323): 241-245.
Krebs, J.R., Healy, S.D. & Shettleworth S.J. 1990. Spatial memory of Paridae: Comparison of a storing and a non storing species, the Coal tit, Parus ater, and the Great tit, P major. Animal Behaviour 39 (6): 1127-1137.
Shettleworth, S.J., Krebs, J.R., Healy, S.D., Thomas, C.M. 1990. Spatial memory of food-storing tits (Parus ater and Parus atricapillus): Comparison of storing and nonstoring tasks. Journal of Comparative Psychology 104 (1): 71-81.
Krebs, J.R., Hilton, S.C., Healy, S.D., Edelman, G.M., Gall, W.E. & Cowan, W.M. 1990. Memory in food-storing birds: Adaptive specialization in brain and behavior. In G. M. Edelman, W. E. Gall, & W. M. Cowan (Eds.), Signal and sense: Local and global order in perceptual maps. New York. Springer: 475-498.
Krebs, J.R., Sherry, D.F., Healy, S.D., Perry, V.H. & Vaccarino, A.L. 1989. Hippocampal specialization of food-storing birds. Proceedings of the National Academy of Sciences of the United States of America 86 (4): 1388-1392.