Silva, Guilherme, 		Silva, Domingos, 		Oliveira, Regigláucia, 		Silva, Maria, AND 		Conceição, Gonçalo.
" Lycophytes and Ferns in the Cerrado of Eastern Maranhão, Brazil" <em>Acta Brasiliensis</em> [Online], Volume 1 Number 2 (24 May 2017)