Martin, C. E.; Brandmeyer, E. A.; Ross, R. D. (2013-01-01). "Ecophysiological function of leaf 'windows' in Lithops species - 'Living Stones' that grow underground". Plant Biology (Stuttgart). 15 (1): 243–247. doi:10.1111/j.1438-8677.2012.00672.x. ISSN1438-8677. PMID23043320.
Martin, C. E.; Brandmeyer, E. A.; Ross, R. D. (2013-01-01). "Ecophysiological function of leaf 'windows' in Lithops species - 'Living Stones' that grow underground". Plant Biology (Stuttgart). 15 (1): 243–247. doi:10.1111/j.1438-8677.2012.00672.x. ISSN1438-8677. PMID23043320.
Martin, C. E.; Brandmeyer, E. A.; Ross, R. D. (2013-01-01). "Ecophysiological function of leaf 'windows' in Lithops species - 'Living Stones' that grow underground". Plant Biology (Stuttgart). 15 (1): 243–247. doi:10.1111/j.1438-8677.2012.00672.x. ISSN1438-8677. PMID23043320.