Published in Jornal de Sciencias Mathematicas, Physicas e Naturaes, in 1891, in volume 2, pages 97-139

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

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1891, in volume 2, issue 6, pages 88

Created: 2014-11-27, modified: 2014-11-27