ENH: scipy.special, Implemented Ellipsoidal harmonic function: the first kind, the second kind and normalization constant 

This is an attempt to implement ellipsoidal harmonic functionality. 
The functions implemented are
ellip_harm, ellip_harm_2, ellip_normal
The sources referred to are:
http://www.geology.osu.edu/~jekeli.1/OSUReports/reports/report_499.pdf
http://arxiv.org/abs/1204.0267
Journal references need to include also the name of the journal and volume. Usually, you can see this informationon the journal pages, in this case http://iopscience.iop.org/1749-4699/5/1/014006

So instead of "pp. 8-10, 2012", the reference is "Comput. Sci. Disc. 5, 014006 (2012)."

Additionally, it's useful to give the DOI (digital object identifier) of the article: "doi:10.1088/1749-4699/5/1/014006".
Most published articles in scientific journals have these, and they can be used to find the article online.