“REEVALUATION OF TETRAGRAPTUS PHYLLOGRAPTOIDES AND T. AKZHARENSIS BIOZONES (LOWER ORDOVICIAN, FLOIAN) FROM THE CORDILLERA ORIENTAL ARGENTINA”. 2013. Ameghiniana 50 (3): 287 – 297. https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/541.