[935] Almquist 1880.

[936] Bitter 1899.

[937] [See p. 237.]

[938] Arnold 1874.

[939] Nylander 1852.

[940] Hue 1915.

[941] Th. Fries 1874, p. 343.

[942] Tobler 1911².

[943] Lindsay 1869².

[944] Winter 1877.