5Dong Zhiyin.Strengthen grass-roots medical institutions and drug storage and maintenance of the. The Chinese community physicians(medicine) . 2011
6Wang Yongbo,Yin Zhaofang,Yu-xing zhang,Wen-jun huang.The problems existing in the pear production in hebei province and the corresponding countermeasures. The fourth national pear production and industrialization of scientific research,academic symposium on . 2005