Condon, N.E. & Friedman, J.R. & Drazen, J.C. (2012)
Metabolic enzyme activities in shallow- and deep-water chondrichthyans: implications for metabolic and locomotor capacity. Marine Biology, 159(8), 1713–1731
DOI: 10.1007/s00227-012-1960-3

Laxson, C.J. & Condon, N.E. & Drazen, J.C. & Yancey, P.H. (2011)
Decreasing Urea: Trimethylamine N-Oxide Ratios with Depth in Chondrichthyes: A Physiological Depth Limit? Physiological and Biochemical Zoology, 84(5), 494–505
DOI: 10.1086/661774