This 1958 Ph.D dissertation was really ground breaking, but never reached publication: http://discovere.emory.edu/primo_library/libweb/action/display.do?tabs=detailsTab&ct=display&fn=search&doc=TN_proquest301908688&indx=1&recIds=TN_proquest301908688&recIdxs=0&elementId=0&renderMode=poppedOut&displayMode=full&frbrVersion=&vid=discovere&mode=Basic&tab=default_tab&dscnt=0&vl(freeText0)=martin%20dickson%20shah%20tahmasb%20&dstmp=1585236029814&fbclid=IwAR2REVHtuRuCFH4HulunNwCDaXGnhwOE3ZV1baEMds_tgkN46zJEx-mJsnM