Principal Component Analysis with Sparse Fused Loadings. Guo, J., James, G., Levina, E., Michailidis, G., & Zhu, J. J Comp Graph Stat, 19(4):930-946, 2011.
bibtex   
@article{guo11pri,
  title = {Principal Component Analysis with Sparse Fused Loadings},
  volume = {19},
  number = {4},
  journal = {J Comp Graph Stat},
  author = {Guo, Jian and James, Gareth and Levina, Elizaveta and Michailidis, George and Zhu, Ji},
  year = {2011},
  keywords = {multivariate,pc,sparse-principal-components},
  pages = {930-946},
  citeulike-article-id = {13265886},
  posted-at = {2014-07-14 14:10:06},
  priority = {0},
  annote = {incorporates blocking structure in the variables;selects different variables for different components;encourages loadings of highly correlated variables to have same magnitude, which aids in interpretation}
}

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