中国科学院数学与系统科学研究院期刊网
MONOTONE APPROXIMATION AND ANALYSIS OF INFLEXION AND SINGULAR POINTS OF 4-n B-SPLINE CURVES
Ye Zheng-lin
Acta Mathematicae Applicatae Sinica . 1990, (1): 56 -63 .  DOI: 10.12387/C1990007