1. Lejemble, P., Gaset, A., Kalck, P., Merle, G. and Molinier, B., 1982. French patent No. 82, 10925.
2. Chegolya, A.S., Ponomarev, A.A., Smirnova, N.S., 1962. Russian patent No. 150.491.
3. Reduction of Furan and the Preparation of Tetramethylene Derivatives