Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1890, in volume 1, pages 200-205

Created: 2012-04-28, modified: 2012-04-28

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1890, in volume 2, issue 5, pages 1-32

Created: 2014-04-04, modified: 2014-04-04