Raghunathan K, Layton JB, Ohnuma T, Shaw AD. Observational research using propensity scores. Adv Chronic Kidney Dis. 2016 Nov;23(6):367-72. doi: 10.1053/j.ackd.2016.11.010
Richards EJ, Chao S, Vongs A, Yang J. Characterization of Arabidopsis thaliana telomeres isolated in yeast. Nucleic Acid Res. 1992 Aug 11;20(15):4039-46.