Published in Jornal de Sciencias Mathematicas, Physicas e Naturaes, Academia Real das Sciencias de Lisboa,, in 1898, in volume 5, pages 133-139

Created: 2013-09-04, modified: 2013-09-04

Published in J. Sci. math. phys. nat., in 1898, in volume 5, pages 157-162

Created: 2013-04-14, modified: 2013-04-14

Published in Jornal de Sciencias Mathematicas, Physicas e Naturaes, in 1898, in volume 5, pages 185-202

Created: 2017-01-25, modified: 2017-01-25