中国科学院数学与系统科学研究院期刊网
Studies on the Determination of Marginal Profit Rate in Rational Application of Fertilizer
Zhang Yufeng;Bai Zhiming;Zhou Naijian
Systems Engineering - Theory & Practice . 1997, (10): 50 -53 .  DOI: 10.12011/1000-6788(1997)10-50