“DICHOGRAPTUS FASCICULATUS NOV. SP. (GRAPTOLITHINA) EN LA FORMACION GUALCAMAYO (ORDOVICICO), PRECORDILLERADE SAN JUAN, REPUBLICA ARGENTINA”. Ameghiniana, vol. 31, no. 1, Dec. 2013, pp. 67-71, https://ameghiniana.org.ar/index.php/ameghiniana/article/view/2190.