C. Pehl, B. Wendl; H. Kaess; A. Pfeiffer, Effects of two anticholinergic drugs, trospium chloride and biperiden, on motility and evoked potentials of the oesophagus., in Aliment Pharmacol Ther, vol.12, n.10, Oct 1998, pp.979-84, PMID 9798802.
R. Jackisch, A. Kruchen; W. Sauermann; G. Hertting; TJ. Feuerstein, The antiparkinsonian drugs budipine and biperiden are use-dependent (uncompetitive) NMDA receptor antagonists., in Eur J Pharmacol, vol.264, n.2, Oct 1994, pp.207-11, PMID 7851484.
M. Rode, L. Smid; M. Budihna; E. Soba; M. Rode; D. Gaspersic, The effect of pilocarpine and biperiden on salivary secretion during and after radiotherapy in head and neck cancer patients., in Int J Radiat Oncol Biol Phys, vol.45, n.2, Sep 1999, pp.373-8, PMID 10487558.
K. Nishiyama, T. Mizuno; M. Sakuta; H. Kurisaki, Chronic dementia in Parkinson's disease treated by anticholinergic agents. Neuropsychological and neuroradiological examination., in Adv Neurol, vol.60, 1993, pp.479-83, PMID 8420174.