G. T. van Belle, H. M. Dyck, R. R. Thompson, J. A. Benson, S. J. Kannappan: Angular Size Measurements of Carbon Miras and S-Type Stars. In: The Astronomical Journal. 114. Jahrgang, Nr.5, 1997, S.2150–2156, doi:10.1086/118635, bibcode:1997AJ....114.2150V.
G. T. van Belle, H. M. Dyck, R. R. Thompson, J. A. Benson, S. J. Kannappan: Angular Size Measurements of Carbon Miras and S-Type Stars. In: The Astronomical Journal. 114. Jahrgang, Nr.5, 1997, S.2150–2156, doi:10.1086/118635, bibcode:1997AJ....114.2150V.