Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1889, in volume 1, pages 8-32

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1889, in volume 1, pages 1-7

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1889, in volume 1, pages 197-199

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1889, in volume 1, pages 33-36

Published in Jornal de sciencias mathematicas, physicas e naturaes, in 1889, in volume 1, pages 186-196