1. Schulte-Mattler, W. J. Use of botulinum toxin A in adult neurological disorders: efficacy, tolerability and safety. CNS Drugs 22, 725–738 (2008).
2. Erbguth, F. J. & Naumann, M. Historical aspects of botulinum toxin: Justinus Kerner (1786–1862) and the ''sausage poison''. Neurology 53, 1850–1853 (1999).
3. van Ermengem, E. Classics in infectious diseases. A new anaerobic bacillus and its relation to botulism. E. van Ermengem. Originally published as ''Ueber einen neuen anaeroben Bacillus und seine Beziehungen zum Botulismus'' in Zeitschrift für Hygiene und Infektionskrankheiten. 26, 1–56, 1897. Rev. Infect. Dis. 1, 701–719 (1979).
4. Scott, A. B., Rosenbaum, A. & Collins, C. C. Pharmacologic weakening of extraocular muscles. Invest. Ophthalmol. 12, 924–927 (1973).
5. Scott, A. B. Botulinum toxin injection into extraocular muscles as an alternative to strabismus surgery. J. Pediatr. Ophthalmol. Strabismus 17, 21–25 (1980).