Biblio
. 1900. “A Hypothesis Regarding The Surface Markings Of Jupiter”. Popular Astronomy (No. 79). Popular Astronomy .
. 1898. “The First Satellite Of Jupiter”. Abdruck Aus Den Astr. Nachr. Bd. 146.. Abdruck Aus Den Astr. Nachr. Bd. 146.
. 1898. “Present Rotation Period Of The First Satellite Of Jupiter And Its Change In Form And Period Since 1892”. The Astronomical Journal (No. 441). The Astronomical Journal.
. 1897. “Drawings Of Jupiter's Third Satellite”. Abdruck Aus Den Astr. Nachr. Bd. 143. Abdruck Aus Den Astr. Nachr. Bd. 143.
. 1894. “Forms Of Jupiter's Satellites”. Popular Astronomy. Popular Astronomy.

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