• Mixup - https://arxiv.org/abs/1710.09412.pdf
• Shake and Shake - https://arxiv.org/pdf/1705.07485.pdf
• Mix Feat - https://openreview.net/forum?id=HygT9oRqFX
• Speed perturbation (ASR) - https://www.danielpovey.com/files/2015_interspeech_augmentation.pdf

Please feel free to extend the list...