Phylogenetic relationships of Eurasian pines (Pinus, Pinaceae) based on chloroplast rbcL, matK, rpl20-rps18 spacer, and trnV intron sequences. - Wang, ,X..R.,.; Tsumura, ,Y.,.; Yoshimaru, ,H.,.; Nagasaka, ,K.,.; and Szmidt, ,A..E.. (Am. J. Bot., 1999)