Update README.md

README.md

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 ![pipeline](pipeline.png)
 
-[SDXL](https://arxiv.org/abs/2307.01952) consists of a mixture-of-experts pipeline for latent diffusion: 
+[SDXL](https://arxiv.org/abs/2307.01952) consists of an [ensemble of experts](https://arxiv.org/abs/2211.01324) pipeline for latent diffusion: 
 In a first step, the base model (available here: https://huggingface.co/stabilityai/stable-diffusion-xl-base-1.0) is used to generate (noisy) latents, 
 which are then further processed with a refinement model specialized for the final denoising steps.
 Note that the base model can be used as a standalone module.