1. Forster, E. O. Microwave drying process for synthetic polymers. U.S. Patent No. 3,434,220, March 25, 1969.
2. Bhartia, P., Stuchly, S. S. and Hamid, M. A. K. Experimental results for combinational microwave and hot air drying. J. Microwave Power. 8. 245. 1973.
3. Humphrey. J. L., Barkdoll, A. E., Jr. and Waterland. A. F. Energy conservation technologies. DOE Report prepared by Argonne National Laboratory. Energy and Environmental Systems Division, DOE Contract No. 31–109–38–0189, September 1981.