Frenguelli, Joaquín. “"Haplostigma furquei" N. Sp. From the Devonian of the Precordillera of San Juan”. Revista de la Asociación Geológica Argentina 7, no. 1 (January 30, 1952): 5-10. Accessed April 24, 2024. https://revista.geologica.org.ar/raga/article/view/945.