] , “30,000 feet and 30 years later: Some thoughts on the deepest presence concept”, Marine Technology Society Journal, vol. 24, pp. 7–8, 1990.
, “Economic and logistic aspects of deep vehicle operations”, in Ocean science and ocean engineering: Transactions of the Joint Conference and Exhibit, 14-17 June, 1965, Washington, D.C., vol. 2, Washington, D.C.: Marine Technology Society, 1965, pp. 858–863.