1. A. Schaarschmidt, Z. angew. Chemie 44, 474 (1931); A. Schaarschmidt, Petroleum 28, 12, 1 (1932); A. Schaarschmidt and M. Marder, Brennstoff-Chemie 13, 412 (1932); A. Schaarschmidt and M. Marder, Z. angew. Chemie 46, 151 (1933).
2. B. L. Moldavskii and S. E. Lifshits, J. Gen. Chem. 5, 3, 423 (1935).
3. W. Leithe, Analyt. Chem. 23, 493 (1951).
4. I. P. Wibaut, H. Hoog, S. L. Langedijk, and I. Overhoff, Recueil trav. chim. 58, 329 (1939).
5. M. I. Konovalov, Nitrating Action of Nitric Acid on Saturated Hydrocarbons (Moscow, 1893).