German article in Die Gartenlaube, 1896, no 15

two-volume publication (1894–1897), part of the series "Hausschatz des Wissens"

German article in Die Gartenlaube, 1898, no. 5

German article in Die Gartenlaube, 1898, no. 9

German article in Die Gartenlaube, 1897, no. 4

German article in Die Gartenlaube, 1896, no. 22

German publication by Paul Matschie published in 1895

German article in Die Gartenlaube, 1897, no. 26

German article in Die Gartenlaube, 1899, no. 22

German article in Die Gartenlaube, 1899, no. 5

German article in Die Gartenlaube, 1897, no. 37

vol. 1 of the book series "Die Süsswasserfauna Deutschlands"

edition of book by Paul Matschie