Tignor, Scott Edward. A Performance Guide to Luigi Nono's Post-Prae-Ludium No. 1 "Per Donau", dissertation, August 2009; (https://digital.library.unt.edu/ark:/67531/metadc11006/m1/1/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .