Analysis on pollution of central air conditioning and ventilation system in public places in Hebei in 2015
GUO Feifei1, MA Zhe2, YANG Feng2, YANG Hui1, NIU Yujie1*
Journal of Hebei Medical University . 2017, (1): 62 -65 .  DOI: 10.3969/j.issn.10073205.2017.01.015