1. The Orientation of Mayan Ceremonial Centers;H Robert;Annals of the Association of American Geographers,1969
2. Lodestone Compass: Chinese or Olmec Primacy? Multidisciplinary analysis of an Olmec hematite artifact from San Lorenzo;John B Carlson;Number 4205. Masao Ohno and Yozo Hamano,1975
3. Pyramids And Ceremonial Centers In Mesoamerica: Were They Oriented Using A Magnetic Compass?;J Kloko?n�k;Studia Geophysica et Geodaetica,2007
4. Chinese tombs oriented by a compass: Evidence from paleomagnetic changes versus the age of tombs;Ivanka Charv�tov�;Studia Geophysica et Geodaetica,2011
5. An Analysis of the Alignment of Archaeological Sites;Mark Carlotto;Journal of Scientific Exploration,2020