The Applications of Ronge-Kutta Method to Seismic Wave Traveltimes 
in Complex Structural Model
ZOU Changqiao,DUAN Yonghong,TAN Qiuhui,XU Jiao,CHEN Libo
jgg . 2015, (5): 894 -897 .  DOI: 10.14075/j.jgg.2015.05.037