1921

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 196, p.324-327, 1921: "The Spiral Nebula Messier 33"

Astronomische Nachrichten, volume 213, p.93, 1921: "Ein neuer Veränderlicher vom P Cygni-Typus"

Astronomische Nachrichten, vol 213, p.315, 1921: "Mitteilung über Nova Cygni 1920"

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 194, p.219, 1921: "The Apparent Distribution of the Novae"

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 195, p.225, 1921: "Suspected New Stars Recorded in Old Chronicles and Among Recent Meridian Observations"

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 195, p.271, 1921: "The Spectrum of Nova T Coronae"

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 196, p.314, 1921: "Nova Aquilae No. 4"

Publ of the Astronomical Society of the Pacific, Vol. 33, No. 196, p.316, 1921: "The Planetary Disk of Nova Cygni (1920)"