Vaughan JR, Anderson GW (March 1949). "Antihistamine agents; halogenated N,N-dimethyl-N-benzyl-N-(2-pyridyl)-ethylenediamines". The Journal of Organic Chemistry. 14 (2): 228–34. doi:10.1021/jo01154a006. PMID18117722.
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US granted 2569314, Kenneth HL, "N, n-dimethyl-n'-(4-halobenzyl)-n'-(2-pyridyl) ethylenediamines and preparation of the same", issued 1951, assigned to American Cyanamide
US granted 2607778, Cates EM, Phillips RF, "Process of preparing n, n-dimethyln'-(p-chlorobenzyl)-n'-(2-pyridyl)-ethylenediamine", issued 1952, assigned to Merck & Co.
CH granted 264754, "Verfahren zur Herstellung eines Äthylendiaminderivates.", issued 1950, assigned to J. R. Geigy AG
CH granted 266234, "Verfahren zur Herstellung eines Äthylendiaminderivates.", issued 1950, assigned to J. R. Geigy AG
CH granted 266235, "Verfahren zur Herstellung eines Äthylendiaminderivates.", issued 1950, assigned to J. R. Geigy AG
GB granted 651596, "Manufacture of n-(2-pyridyl)-n-(p-chloro-benzyl)-n:n-dimethyl-ethylenediamine", issued 1951, assigned to J. R. Geigy AG
