1. Simpson, J. Y.: Monthly journal of medical science19, 564. 1854.
2. Lee, C.: Americ. journ. of the med. sciences40, 391–394.
3. Mills, C. K.: Philadelphia, med. Times6, 148–171. 1875.
4. Image, F. E.: Practitioner20, 401. 1878.
5. Kobert, R.: Lehrbuch der Intoxikationen. Bd. 2, S. 413. Stuttgart 1906.