C. Ernest Birchenall ... [and others] ; prepared for National Aeeronautics and Space Administration, Lewis Research Center, under grant NSG-3184, for U.S. Department of Energy, Conservation and Solar Energy, Division of Energy Storage Systems under interagency agreement EC-77-A-31-1034
J.F. Walther ... [and others] ; prepared for National Aeronautics and Space Administration, Lewis Research Center for U.S. Department of Energy, Conservation and Renewable Energy, Division of Energy Storage Systems under interagency agreement DE-A104-80AL12-726