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Gillian Adam; Harry Duncan. (2001). Development of a sensitive and rapid method for the measurement of total microbial activity using fluorescein diacetate (FDA) in a range of soils. , 33(7-8), 0–951. doi:10.1016/s0038-0717(00)00244-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research