Reference:

Juuso Parkkinen, Janne Sinkkonen, Adam Gyenge, and Samuel Kaski. A block model suitable for sparse graphs. In Proceedings of the 7th International Workshop on Mining and Learning with Graphs (MLG 2009), Leuven, Belgium, July 2-4 2009. Extended Abstract.

Suggested BibTeX entry:

@inproceedings{Parkkinen09mlg,
    address = {Leuven, Belgium},
    author = {Juuso Parkkinen and Janne Sinkkonen and Adam Gyenge and Samuel Kaski},
    booktitle = {Proceedings of the 7th International Workshop on Mining and Learning with Graphs (MLG 2009)},
    month = {July 2-4},
    note = {Extended Abstract},
    title = {A Block Model Suitable for Sparse Graphs},
    year = {2009},
}