A convolutional neural network–back propagation based three-layer combined forecasting method for spare part demandGuoxing Huang, Yukang Yang, Weichang Li, Xianhuai Cao and Zhipeng YangRAIRO-Oper. Res., 58 5 (2024) 4181-4195DOI: https://doi.org/10.1051/ro/2024159