Unexpected Positive Buoyancy in Deep Sea Sharks, Hexanchus griseus, and a Echinorhinus cookei Nakamura, Itsumi ; Meyer, Carl G. ; Sato, Katsufumi Abstract Publication: PLoS ONE Pub Date: June 2015 DOI: 10.1371/journal.pone.0127667 Bibcode: 2015PLoSO..1027667N