Published in Jahrb. Hamb. Wiss. Anst, in 1888, in volume 5, pages 3-10

Published in Jahrb. Hamburg. Wiss. Anst., in 1888, in volume 5, pages 11-17

Published in Jahrb. Hamburg. Wiss. Anst., in 1888, in volume 5, pages 23-45