I. Om matematiske værdier af musikalske toner og korncirklers geometriske forhold, ved Gerald Hawkins og andre:

https://cropcircleconnector.com/ilyes/ilyes16.html
https://cropcircleconnector.com/Dutch/CROPCIRCLESAN%20QUANTUMMECHANICS.html
https://www.cropcirclesecrets.org/hawkins.html
https://www.cropcirclesecrets.org/crop_circles_theorems.html
https://www.cropcirclesecrets.org/hawkinsb.html
https://www.cropcirclesecrets.org/crop_circles_diatonics.html

II. Mangesidet korncirkelgeometrisk forskning ved Bert Janssen:

https://www.cropcirclesandmore.com/content/welcome.html

III. Geometrisk konstruktion af korncirklers former:

https://www.cropcircle-archive.com/1_UK/3_geo/geo.html klik "geometry"
https://www.zefdamen.nl/CropCircles/en/Crop_circles_en.htm
https://www.sayer.abel.co.uk/geometry.htm
https://www.cropcirclesecrets.org/crop_circles_sacredgeo.html
https://www.martinkeitel.net/cropcircles/ klik på "articles & research"

IV. Pentagonal geometri i korncirkler, ved Wolfgang Schindler:

http://www.kornkreise.info/schindler (kopier adressen i et nyt vindue, åbne det, klik "T", så "evolution and geometry")

http://www.kornkreise.info/schindler/shape_and_geometry.pdf (kopier adressen i et nyt vindue og åbne det der)