1. Ala D (1996) High-resolution isotope stratigraphy of the Lower Devonian. Unpublished MS Thesis, University of Ottawa, Ottawa, pp 1?159
2. Alonso JL, Suárez Rodriguez A, Rodriguez Fernández LR, Farias P, Villegas F (1991) Mapa Geológico: La Pola de Gordón. 1:50.000 IGME, Madrid
3. Auclair AC, Joachimski MM, Lécuyer C (2003) Deciphering kinetic, metabolic and environmental controls on stable isotope fractionations between seawater and the shell of Terebratalia transversa. Chem Geol 202 (1?2):59?79
4. Ayllon F (2003) Mineral, fluid and thermal evolution in veins from late orogenic coal basins of the Cantabrian Zone (Variscan, NW Spain). Dissertation am Geologisch-Paläontologischen Institut der Universität Heidelberg. URL: http://www.ub.uni-heidelberg.de/archiv/3391
5. Baadsgaard H, Chaplin C, Griffin WL (1986) Geochronology of the Gloserneia pegmatite, Froland, Southern Norway. Nor Geol Tidsskr 64:111?119