1. Banerjee, M. and Richardson, T. (2003). On a dualization of graphical gaussian models: a correction note. Scand. J. Statist. 30, 817–820.
2. Buhl, S. L. (1993). On the existence of maximum likelihood estimators for graphical gaussian models. Scan. Journal of Statistics 20, 263–270.
3. Castelo, R. and Roverato, A. (2006). A robust procedure for gaussian graphical models search for microarray data with p larger than n. Journal of Machine Learning Research 57, 2621–2650.
4. Chaudhuri, S., Drton, M. and Richardson, R. T. (2007). Estimation a covariance matrix with zeros. Biometrika 94, 199–216.
5. Cox, D. R. and Wermuth, N. (1996). Multivariate Depencies: Models, Analysis and Interpretations. Chapman and Hall, Boca Raton.