Zha, Wenshu, et al. “Reconstruction of Shale Image Based on Wasserstein Generative Adversarial Networks With Gradient Penalty”. Advances in Geo-Energy Research, vol. 4, no. 1, Mar. 2020, pp. 107-14, https://www.astp-agr.com/index.php/2207-9963/article/view/111.