C. Kim

Distinguishing optimism from pessimism in older adults: is it more important to be optimistic or not to be pessimistic?

R. MacCallum, S. Robinson-Whelen, J. Kiecolt-Glaser, 1997, Journal of personality and social psychology.

Studying Multivariate Change Using Multilevel Models and Latent Curve Models.

R. MacCallum, Cheongtag Kim, W. Malarkey, 1997, Multivariate behavioral research.