[575] Nienburg 1908.
[576] Harper 1900.
[577] Guilliermond 1904, p. 60.
[578] Baur 1899.
[579] Sturgis 1890.
[580] Nienburg 1908.
[581] Schwendener 1864.
[582] Wahlberg 1902.
[583] Baur 1904.
[584] Brown 1911.
[575] Nienburg 1908.
[576] Harper 1900.
[577] Guilliermond 1904, p. 60.
[578] Baur 1899.
[579] Sturgis 1890.
[580] Nienburg 1908.
[581] Schwendener 1864.
[582] Wahlberg 1902.
[583] Baur 1904.
[584] Brown 1911.