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* [[Albrecht Heeffer]] ('''2017'''). ''Arithmetic in the Renaissance.'' [https://link.springer.com/referencework/10.1007/978-3-319-02848-4 Encyclopedia of Renaissance Philosophy], Ed. [https://en.wikipedia.org/wiki/Marco_Sgarbi Marco Sgarbi], [https://en.wikipedia.org/wiki/Springer_Science%2BBusiness_Media Springer]
* [[Albrecht Heeffer]] ('''2017'''). ''Using Invariances in Geometrical Diagrams: Della Porta, Kepler and Descartes on Refraction''. [https://link.springer.com/book/10.1007%2F978-3-319-50215-1 The Optics of Giambattista Della Porta (ca. 1535–1615): a Reassessment], [https://en.wikipedia.org/wiki/Springer_Science%2BBusiness_Media Springer]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=41059 Comparing Bionic-Impakt vs Bionic] by [[Albrecht Heeffer]], [[CCC]], January 27, 1999 » [[Engine Similarity]], [[Bionic Impakt]], [[Bionic]]
=External Links=
[[Category:Mathematician|Heeffer]]
[[Category:Shogi Player|Heeffer]]
[[Category:Chess Programmer|Heeffer]]
[[Category:Videos|Heeffer]]
