Rowntree, Robert. "Measurements of the optical constants of magnesium oxide and calcium tungstate in the spectral region between 10 cm⁻¹ and 100 cm⁻¹ at 300̊K and 90̊K /." Doctoral dissertation, Ohio State University, 1963. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486551575625575Chicago Manual of Style (17th edition)