In the 1980s Lindley and Boxall showed that the above relies solely on C.P.E. Bach's testimony: all the extant fingerings from J.S.Bach and his circle use the ancient methods, with very limited use of the thumb.
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In 1971 Julien Musafia published his book "The Art of Fingering in Piano Playing" (M.C.A., New York, N.Y., 90 pages).
In 1979, the neo-traditional art music composer and founder of the Pan African Orchestra of Ghana, Nana Danso Abiam (b. 1953) introduced chromaticism and atonality in atenteben music with a new fingering mechanism that he had developed at the Institute of African Studies, University of Ghana, Legon.