Wang, Peng, et al. “DISCUSSION ON THE UPGRADING AND TRANSFORMATION OF RURAL DOMESTIC SEWAGE PIPE NETWORK-TAKING TONG’AN DISTRICT OF XIAMEN CITY AS AN EXAMPLE”. Interdisciplinary Journal of Engineering and Environmental Sciences, vol. 10, no. 1, Sept. 2023, pp. 1-7, https://sadijournals.org/index.php/ijees/article/view/489.