Published in Bollettino del Laboratorio in Portici, in 1920, in volume 14, pages 216-218

Created: 2012-06-22, modified: 2012-06-22

Published in Bollettino del Laboratorio in Portici, in 1920, in volume 14, pages 219-250

Created: 2012-06-22, modified: 2012-06-22