Cramer, F. H., and M. del C. Diez de Cramer. “EXCLUSIVE OCCURRENCE OF CHITINOZOANS AND MIOSPORES IN A SHALE OF DEVONIAN AGE FROM THE MALVINAS ISLANDS”. Ameghiniana, vol. 9, no. 3, Aug. 2013, pp. 220-2, https://ameghiniana.org.ar/index.php/ameghiniana/article/view/1385.