Nariyana, Calvien Danny, et al. “Prediction of Purchase Volume Coffee Shops in Surabaya Using Catboost With Leave-One-Out Cross Validation”. Jurnal Ilmiah Teknik Elektro Komputer Dan Informatika, vol. 11, no. 1, Mar. 2025, pp. 124-38, doi:10.26555/jiteki.v11i1.30610.