To cite Somoclu in publications, please use:

Peter Wittek, Shi Chao Gao, Ik Soo Lim, Li Zhao (2017). Somoclu: An Efficient Parallel Library for Self-Organizing Maps. Journal of Statistical Software, 78(9), 1-21.

A BibTeX entry for LaTeX users is

@Article{wittek2017somoclu,
  author =    {Wittek, Peter and Gao, Shi Chao and Lim, Ik Soo and Zhao, Li},
  title =     {Somoclu: An Efficient Parallel Library for Self-Organizing Maps},
  journal =   {Journal of Statistical Software},
  year    =   {2017},
  volume  =   {78},
  number  =   {9},
  pages   =   {1--21},
  doi     =   {10.18637/jss.v078.i09}
}

You may also consider adding a link to the code. Please cite the PyPI version:

https://pypi.python.org/pypi/somoclu/

This ensures that Depsy (http://depsy.org/) can aggregate the usage statistics of the library.
