Enlace Permanente
https://bdu.siu.edu.ar/bdu/Record/paper:paper_00207136_v42_n1_p59_Pereyra%C3%83%C2%A2%C3%82%C2%80%C3%82%C2%90Alfonso
https://bdu.siu.edu.ar/bdu/Record/paper:paper_00207136_v42_n1_p59_Pereyra%C3%83%C2%A2%C3%82%C2%80%C3%82%C2%90Alfonso