old (1939) but interesting paper, showing that the subject is studied at least since the end of the 19th century.
THE DIFFERENCES BETWEEN NATURAL
AND HUMAN FLAKING ON PREHISTORIC
FLINT IMPLEMENTS
By ALFRED S. BARNES
https://anthrosource.onlinelibrary.wiley.com/doi/pdf/10.1525/aa.1939.41.1.02a00080
AMERICAN ANTHROPOLOGIST ; 1939
