Jeong, K. S., J. K. Shin, M. Maki, and J.-H. Pak. “Phylogeny of <i>Galium</I> L. (Rubiaceae) from Korea and Japan Based on Chloroplast DNA Sequence”. Bangladesh Journal of Plant Taxonomy, vol. 23, no. 2, Dec. 2016, pp. 237-46, doi:10.3329/bjpt.v23i2.30858.