Book:
The Mathematics of Marriage: Dynamic Nonlinear Models
John M. Gottman, J.D. Murray, Catie Swanson, Rebecca Tyson, Kristin R. Swanson
MIT Press, Spring 2002

Review article:
John M. Gottman. Psychology and the Study of Marital Processes. Annu. Rev. Psychol. 49: 169-97, 1998

J. Cook, R. Tyson, J. White, J. Rushe, J.M. Gottman, J.D. Murray. The mathematics of marital conflict: qualitative dynamic mathematical modeling of marital interaction. J. Fam. Psychol. 9: 110-130, 1995.