Hoekstra, A.; Vos, A. (1975). "The Crystal and Molecular Structures of Tetraphenylhydrazine and Related Compounds at –160°C. II. The Crystal Structures of Tetraphenylethylene (TPE) and Diphenylaminotriphenylmethane (DTM)". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 31 (6): 1716–1721. Bibcode:1975AcCrB..31.1716H. doi:10.1107/S0567740875005973.
Hoekstra, A.; Vos, A. (1975). "The Crystal and Molecular Structures of Tetraphenylhydrazine and Related Compounds at –160°C. II. The Crystal Structures of Tetraphenylethylene (TPE) and Diphenylaminotriphenylmethane (DTM)". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 31 (6): 1716–1721. Bibcode:1975AcCrB..31.1716H. doi:10.1107/S0567740875005973.