Background on graphical models
Graphical models, Lauritzen, 1996.
Graphical models in a nutshell, Koller et al 2007.
Graphical models: node sparsity & node perturbation
Learning graphical models with hubs, Tan et al, 2014
Node-based learning of multiple Gaussian graphical models, Mohan et al 2014
Overlapping group lasso
Penalty where the support is disjoint from most groups:
Structured Variable Selection with Sparsity-Inducing Norms, Jenatton et al 2011.
Penalty where the support can be written as a union of groups: Group Lasso with overlap and graph Lasso. Jacob, Obozinski, and Vert, 2009.