Chishun Kanayama Shigeru Masuyama Animation of tree sway. 43-52 1998 29 Systems and Computers in Japan 1 http://dx.doi.org/10.1002/(SICI)1520-684X(199801)29:1<43::AID-SCJ5>3.0.CO;2-R db/journals/scjapan/scjapan29.html#KanayamaM98