YANG, C., X. WANG, Y. QIN, X. SUN, Q. WANG, H. LIN, and D. XI. “Morphological and Physiological Changes in Sedum Spectabile During Flower Formation Induced by Photoperiod”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Vol. 43, no. 2, Dec. 2015, pp. 426-31, doi:10.15835/nbha4329824.