Трехмерные формы кругов на полях

1. "Crop Circle Geometry: 3-D Fractals", http://www.bertjanssen.nl/content/cropc/cropgeo06fr.html.

2. "Crop Circle Geometry - size, placing and ratios", http://www.bertjanssen.nl/content/cropc/cropgeo03sp.html.

3. "Crop Circle Geometry - 3 D crop circle models", http://www.bertjanssen.nl/content/cropc/cropgeo07cm.html.

4. "The perfect circular geometry of the Harlequin Triangle", http://www.martinkeitel.net/cropcircles/harlequin/harle.page1.html.

5. "The next dimension of the Harlequin Triangle", http://www.martinkeitel.net/cropcircles/harlequin/3dmath.html.

6. Gerald Hawkins' Latest Work, Part 4, http://www.cropcirclesecrets.org/hawkinse.html.

7. "Interesting Shapes & 3D Geometry", http://www.cropcircleresearch.com/research/shapes.html.

8. "Dr Gerald Hawkins' Elusive Fifth Theorem!", http://cropcircleconnector.com/ilyes/ilyes16.html.

9. "Crop Circles - The Hidden Form", http://www.hypermaths.org/cropcircles/frontpage/index.html

Платоновы твердые Тела

1. "Octahedron", http://mathworld.wolfram.com/Octahedron.html.

2. "Tetrahedron", http://mathworld.wolfram.com/Tetrahedron.html.

3. "Regular Polyhedra or Platonic Solids", http://www.enchantedlearning.com/math/geometry/solids.

Круги на полях и вращающиеся тетраэдры

1. "The tetrahedral pattern", http://archiv.fgk.org/rowold/place1.html.

2. "The flow of life-energy", http://archiv.fgk.org/rowold/place2.html.

3. "Unfolding the crop circles - Part I", http://archiv.fgk.org/rowold/unfold.html.

4. "Unfolding the crop circles - Part II ", http://archiv.fgk.org/rowold/unfold2.html.

5. "Research concerning the Tetrahedron", http://archiv.fgk.org/rowold/unfold3.html.

6. "Part III: Unfolding the Crop Circles Around the World ", http://archiv.fgk.org/rowold/unfold3a.html.