Adrian van Maanen

[1946] Adriaan Van Maanen, 1884-1946 ; Frederick H. Seares ; PASP 58 (1946) p. 89 [lien]
[1972] Adrian van Maanen and Internal Motions in Spiral Nebulae: a Historical Review ; N. S. Hetherington ; Quarterly Journal of the Royal Astronomical Society 13 (1972) p. 25 [lien]
[1974] Adriaan van Maanen on the Significance of Internal Motions in Spiral Nebulae ; Norriss S. Hetherington ; Journal for the History of Astronomy 5 (1974) p. 52 [lien]