See:
- https://en.wikipedia.org/wiki/Dolmen_of_Menga
- Jose Antonio Lozani et all, Prehistoric engineering and astronomy of the great Menga Dolmen (Málaga, Spain). A geometric and geoarchaeological analysisPrehistoric engineering and astronomy of the great Menga Dolmen (Málaga, Spain). A geometric and geoarchaeological analysis in:Journal of Archaeological Science,Volume 41, January 2014, pp. 759–771 - https://www.academia.edu/10225993
