====== Flying Dragon ======
  * [[https://doi.org/10.21273/JASHS.120.2.286|Cheng, F. S., & Roose, M. L. (1995). Origin and inheritance of dwarfing by the citrus rootstock Poncirus trifoliataflying dragon']]
  * [[https://www.intechopen.com/chapters/81780|]]