Toothaker, Wallis Lee. Hydantoins as Anticonvulsants. IV. The Synthesis of 5-Substituted-5-(2-Tetrahydropyranyl) Hydantoins, thesis, 1950; (https://digital.library.unt.edu/ark:/67531/metadc83670/m1/1/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .