Furnes, Harald; Muehlenbachs, Karlis; Tumyr, Ole; Torsvik, Terje; Thorseth, Ingunn H. (1999): Depth of active bio-alteration in the ocean crust; Costa Rica Rift (Hole 504B). Blackwell, Oxford, United Kingdom, Terra Nova, 11 (5), 228-233, georefid:2001-075969