References
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.. [BPC11] Boyd, S., Parikh, N., Chu, E., Peleato, B., and Eckstein,
   J. "Distributed Optimization and Statistical Learning via the
   Alternating Direction Method of Multipliers." *Foundations and
   Trends in Machine Learning*, Vol. 3, No. 1, 2011, pp. 1–122.

.. [CKB13] Chu, E., Keshavarz, A., and Boyd, S. "A Distributed
   Algorithm for Fitting Generalized Additive Models." Stanford
   University, 2013.