New Techniques in Twentieth-Century Solo Piano Music. An Expansion of Pianistic Resources from Cowell to the Present - Harrel, Doris Leland (Ann Arbor, MI UMI, 1976)
"Dissertation presented to the Faculty of the Graduate School of the University of Texas at Austin in Partial Fulfillment of the Requirements for the Degree of Doctor of Musical Arts"
Keywords: Cowell, Henry -- 1897-1965; Crumb, George -- 1929-2022; 20th Century (1901-2000); Piano; Keyboard music; Extended technique