Biblio
“A Hypothesis Regarding The Surface Markings Of Jupiter”. Popular Astronomy (No. 79). Popular Astronomy .
. 1900. 
“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.
. 1898. 
“Drawings Of Jupiter's Third Satellite”. Abdruck Aus Den Astr. Nachr. Bd. 143. Abdruck Aus Den Astr. Nachr. Bd. 143.
. 1897. 
“Forms Of Jupiter's Satellites”. Popular Astronomy. Popular Astronomy.
. 1894. 