1. (a) Kishner, N. J. Russ. Phys. Chem. Soc. 1911, 43, 582-595. Nicolai Kishner was a Russian chemist.
2. (b) Wolff, L. Ann. 1912, 394, 86.
3. (c) Huang, Minlon J. Am. Chem. Soc. 1946, 68, 2487-2488.
4. (d) Huang, Minlon J. Am. Chem. Soc. 1949, 71, 3301-3303. (The Huang Minlon modification).
5. Todd, D. Org. React.
1948, 4, 378–422. (Review).