Template:Christensen et al., 2014
- Christensen, K.I., Zarrei, M., Kuzmina, M., Talent, N., Lin, C., Dickinson, T.A. 2014. Crataegus ×ninae-celottiae and C. ×cogswellii (Rosaceae, Maleae), two spontaneously formed intersectional nothospecies. PhytoKeys 36: 1–26. DOI: 10.3897/phytokeys.36.6784
.
