Tullar BF, Wetterau W, Archer S (November 1948). "The Resolution of Ethyl 1,1-Diphenyl-3-dimethylaminobutyl Sulfone". Journal of the American Chemical Society. 70 (11): 3959–3960. Bibcode:1948JAChS..70R3959T. doi:10.1021/ja01191a532. PMID18207952.
US patent 2618640, Archer S, Suter CM, Tullar BF, "Certain amino hydrocarbon sulfones and process of preparation", issued 1952-11-18, assigned to Sterling Drug
Tullar BF, Wetterau W, Archer S (November 1948). "The Resolution of Ethyl 1,1-Diphenyl-3-dimethylaminobutyl Sulfone". Journal of the American Chemical Society. 70 (11): 3959–3960. Bibcode:1948JAChS..70R3959T. doi:10.1021/ja01191a532. PMID18207952.
Tullar BF, Wetterau W, Archer S (November 1948). "The Resolution of Ethyl 1,1-Diphenyl-3-dimethylaminobutyl Sulfone". Journal of the American Chemical Society. 70 (11): 3959–3960. Bibcode:1948JAChS..70R3959T. doi:10.1021/ja01191a532. PMID18207952.