Being and Going

Being and Going by Paul Lansky

George Perle

http://books.google.com/books?id=w-oHbWUlI0cC&pg=PA36&lpg=PA36&dq=george+perle+12+tone+modal+system&source=bl&ots=mMki7kxOi1&sig=LV8j6Y-QZ6kwMTzhv4i2R-OUATY&hl=en&ei=t9qaS-fxOcKVtgeO2KlV&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAgQ6AEwAQ#v=onepage&q=&f=false

A method of analysing harmony, based on interval patterns or “Gestalten”

SpringerLink - Book Chapter