Battinelli, P. και άλλοι. (May 1992). «CCD Photometric and Spectroscopic Observations of the Young Open Cluster NGC 433». Astronomical Journal103: 1596. doi:10.1086/116172. Bibcode: 1992AJ....103.1596B.
Battinelli, P. και άλλοι. (May 1992). «CCD Photometric and Spectroscopic Observations of the Young Open Cluster NGC 433». Astronomical Journal103: 1596. doi:10.1086/116172. Bibcode: 1992AJ....103.1596B.