Ratna Sari Dewi and Sunarsini (2006) “Kajian Integral Cavalieri-Wallis dan Integral Porter-Wallis serta Kaitannya dengan Integral Riemann”, Limits: Journal of Mathematics and Its Applications, 3(2), p. 81. vailable at: https://journal.its.ac.id/index.php/limits/article/view/5360 (ccessed: 6December2025).