[965] Zukal 1896, p. 258.

[966] Zukal 1896, p. 255.

[967] Cunningham 1879.

[968] Friedrich 1906, p. 401.

[969] [See p. 78.]

[970] Gleditsch 1775, p. 31.

[971] Lindau 1895, p. 53.

[972] Dufrenoy 1881.

[973] Porter 1917.

[974] Friedrich 1906.