Guangjun Liu, Xiaoping Xu, Feng Wang, Long Liu. Estimation of Polytropic Points of Digital Characteristic Variance in Flat Panel Data. JFCR [Internet]. 2022Mar.29 [cited 2024May18];:1188-96. Available from: http://www.forestchemicalsreview.com/index.php/JFCR/article/view/630