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Andrew M. Blake. COMPUTATIONAL ANALYSIS OF QUARTER-TONE COMPOSITIONS BY CHARLES IVES AND IVAN WYSCHNEGRADSKY
Now and Zen - a podcast
http://www.tonalsoft.com/enc/encyclopedia-index.aspx
https://yahootuninggroupsultimatebackup.github.io/tuning/
https://mtosmt.org/issues/mto.19.25.1/mto.19.25.1.willis.html