David E. McCauley, Maia F. Bailey, Allyson K. Sundby and Mark E. Welch. "Inheritance of chloroplast DNA is not strictly maternal in Silene vulgaris (Caryophyllaceae): evidence from experimental crosses and natural populations" American Journal of Botany Vol. 94 Iss. 8 (2007)
Available at: http://works.bepress.com/maia_bailey/9/