English: Petersen, Hans Joergen; Nielsen, C. Kaergaard; Arrigoni-Martelli, E. (1978). "Synthesis and hypotensive activity of N-alkyl-N-cyano-N'-pyridylguanidines". Journal of Medicinal Chemistry 21 (8): 773–781. doi:10.1021/jm00206a011.
Hans J. Petersen, USRE31244E (1983 to Leo Pharma AS).
Hans Jorgen Petersen, US4057636 (1977 to Leo Pharma AS).
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