To cite spqdata in publications use: Ruiz M, López FA, A Páez. (2010). Testing for spatial association of qualitative data using symbolic dynamics. Journal of Geographical Systems. 12 (3) 281-309 URL https://doi.org/10.1007/s10109-009-0100-1. A BibTeX entry for LaTeX users is @Article{, title = {Testing for spatial association of qualitative data using symbolic dynamics}, author = {Manuel Ruiz and Fernando Lopez and Antonio Paez}, journal = {Journal of Geographical Systems}, year = {2010}, volume = {12}, number = {3}, pages = {281--309}, url = {https://doi.org/10.1007/s10109-009-0100-1}, }