J. L. Gutierrez-Villanueva, C. Sainz-Fernández, I. Fuente-Merino, J. C. Sáez-Vergara, E. Correa-Garcés y L. S. Quindos-Poncela. Intercomparison exercise on external gamma dose rate under field conditions at the laboratory of natural radiation (Saelices el Chico, Spain) [Documento pdf]