Om ganoidernes Begraendsing og Inddeling
Published: 1869
Place of publication: Kjøbenhavn
Language: dan
Number of pages: 82
Notes: Vidensk. Meddel. Naturhist. Forening. 1868. 1-82.

Followed by Prof. Kner "On the classification of the ganoids". (Reprinted from the Geological Magazine, vol. V., 1858). pp. 7.