Kaplan, Melvin. "Part I, a study of the influence of electronegative substituents on the cis-trans isomerization of azobenzene : part II, a study of certain derivatives of carbonyl compounds /." Doctoral dissertation, Ohio State University, 1954. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486476025024865Chicago Manual of Style (17th edition)