Chicago, The Open court publishing company;1904.

scientific article published in 1912

scientific article published on 29 December 1893

scientific article published in 1916

scientific article published in 1902

scholarly article by Auguste Forel published 1887 in Mitteilungen der Schweizerischen Entomologischen Gesellschaft

article published in 1923

Paris: L'Imprimerie nationale, 1890-91.

scientific article published in 1907

scientific article published in 1914

scientific article published in 1906

scientific article published in 1902

scientific article published in 1901

scientific article published in 1913

scientific article published in 1901

scientific article published in 1901

scientific article published in 1911

book edition published in 1924