English: Schaefer H, Hackmack G, Eistetter K, Krüger U, Menge HG, Klosa J. [Synthesis, physical-chemical properties and pharmacologically-oriented screening studies on budipine and related 4,4-diphenylpiperidines]. Arzneimittelforschung. 1984;34(3):233-40. PMID: 6539602.
DE1936452 idem Heinz Gunter Menge, Josef Klosa, US4016280 (1977 to Byk Gulden Lomberg Chemische Fabrik Gmbh).
Gerhard Hackmack & Josef Klosa, US4022786 (1977 to Takeda GmbH).
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