Gatewood, G.; Russell, J. (July 1974), «Astrometric determination of the gravitational redshift of van Maanen 2 (EG 5)», Astronomical Journal79: 815–818, Bibcode1974AJ.....79..815G, DOI:10.1086/111613 – Se §III for fastsatte verdier for masse, radius og gravitasjon.
Burleigh, M. R. m. fl.. (May 2008), «The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)», Monthly Notices of the Royal Astronomical Society: Letters386 (1): L5–L9, Bibcode2008MNRAS.386L...5B, DOI:10.1111/j.1745-3933.2008.00446.x
Gatewood, G.; Russell, J. (July 1974), «Astrometric determination of the gravitational redshift of van Maanen 2 (EG 5)», Astronomical Journal79: 815–818, Bibcode1974AJ.....79..815G, DOI:10.1086/111613 – Se §III for fastsatte verdier for masse, radius og gravitasjon.
Burleigh, M. R. m. fl.. (May 2008), «The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)», Monthly Notices of the Royal Astronomical Society: Letters386 (1): L5–L9, Bibcode2008MNRAS.386L...5B, DOI:10.1111/j.1745-3933.2008.00446.x
Se Makarov, «A Substellar Companion to van Maanen 2» (Astrophys. J., 600, L71-L73 (2004), Bibcode: 2004ApJ...600L..71M), og Farihi et al., og «Mid-infrared observations of Van Maanen 2: no substellar companion» (Astrophys. J., 608, L109-L112 (2004), Bibcode: 2004ApJ...608L.109F.)