Ning ZhaoFangmin LiXuedong LiuYanyan LiSignal processing of pyroelectric infrared sensor for classification of multiple moving human targets.419-436201710Int. J. Inf. Commun. Technol.4https://doi.org/10.1504/IJICT.2017.10004809db/journals/ijict/ijict10.html#ZhaoLLL17