@article {Walsh1990,
	title = {{30,000 feet and 30 years later: Some thoughts on the deepest presence concept}},
	journal = {Marine Technology Society Journal},
	volume = {24},
	number = {2},
	year = {1990},
	pages = {7{\textendash}8},
	issn = {0025-3324},
	author = {Walsh, D}
}
