@software{mark_a_wieczorek_2015_12158, author = {Mark A. Wieczorek}, title = {{SHTOOLS - Tools for working with spherical harmonics (v2.9.1)}}, month = jun, year = 2015, publisher = {Zenodo}, version = {v2.9.1}, doi = {10.5281/zenodo.12158}, url = {https://doi.org/10.5281/zenodo.12158} }