Alternative energy sources IV -- [proceedings of the fourth Miami International Conference on Alternative Energy Sources, December 14 - 16, 1981, Miami Beach, Florida] / ed. by T. Nejat Veziroglu ; Vol. 6, Alternative energy sources IV : proceedings of the fourth Miami International Conference on Alternative Energy Sources, December 14 - 16, 1981, Miami Beach, Florida / ed. by T. Nejat Veziroglu -- vol. 6