Voelk, Eric. "Synthesis of 3,8-dicarbethoxyamino-2,4,7,9- tetrafluorophenanthridine and 3,8-dicarbethoxyamino-2,4,7,9- tetrafluorobenzo(c)cinnoline." Master's thesis, Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1106769279Chicago Manual of Style (17th edition)