McPherson, James. "Part I. The syntheses and reactions of methyl 2-methyl-3-oxo-1-cyclopentene-1-carboxylate and ethyl 2-methyl-3-oxocyclopentanecarboxylate ; Part II. A study of the reactions of Grignard readgents with esters of Levulinic acid /." Doctoral dissertation, Ohio State University, 1953. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486562769444115Chicago Manual of Style (17th edition)