(4) Schwabe, S. J., and Carew, J. L., 2006, Blue Holes: an inappropriate moniker for water-filled caves in the Bahamas (pdf)
(7) Herbert, R. A., Ranchou-Peyruse, A. Duran, R., Guyoneaud R., and Schwabe, S., 2005, Characterization of purple sulfur bacteria from the South Andros Black Hole Cave system: highlights taxonomic problems for ecological studies among the genera Allochromatium and Thiocapsa (pdf)