1. Bourne, D. W. & Heezen, B. C. A wandering enteropneust from the abyssal Pacific, and the distribution of ‘spiral’ tracks on the sea floor. Science 150, 60–63 (1965)
2. Ewing, M. & Davis, R. A. in Deep Sea Photography (ed. Hersey, J. B.) 259–294 (Johns Hopkins Press, Baltimore, Maryland, 1967)
3. Jacobs, S. S., Bruchhausen, P. M. & Bauer, E. B. Hydrographic Stations, Bottom Photographs, Current Measurements, and Nephelometer Profiles. Eltanin Reports, Cruises 32–36 (Lamont-Doherty Geological Observatory, Palisades, New York, 1970)
4. Heezen, B. C. & Hollister, C. D. The Face of the Deep (Oxford Univ. Press, New York, 1971)
5. Lemche, H., Hansen, B., Madsen, F. J., Tendal, O. S. & Wolff, T. Hadal life as analyzed from photographs. Vidensk. Meddr. Dansk Naturh. Foren. 139, 262–336 (1976)