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https://www.brummm.com/wheels-and-waves-2013/hermann-koepf-l1019976/
Hermann-Koepf-L1019976 | BRUMMM M.C. Magazine
m chermannmagazine
https://aconnect.de/friends/editions/writings/fb_paper_46/r_sym_scales_root.html
Koepf's Editions - Alle 95 spiegelsymmetrischen Skalen im Tonumfang einer Oktav, ohne Umkehrungen
Siegfried Koepf - Writings - Alle 95 spiegelsymmetrischen Skalen im Tonumfang einer Oktav, ohne Umkehrungen