Denoising Diffusion Implicit Models, Jiaming Song, Chenlin Meng, Stefano Ermon, 2020International Conference on Learning Representations (ICLR 2021)DOI: 10.48550/arXiv.2010.02502 - Introduces DDIM, a deterministic sampling method for diffusion models, which serves as a foundational first-order ODE solver for the reverse process.