Four-winged dinosaurs from China

@article{Xu2003FourwingedDF,
  title={Four-winged dinosaurs from China},
  author={Xing（徐星） Xu and Zhonghe Zhou and Xiaolin Wang and Xuewen Kuang and Fucheng Zhang and Xiangke Du},
  journal={Nature},
  year={2003},
  volume={421},
  pages={335-340}
}
Although the dinosaurian hypothesis of bird origins is widely accepted, debate remains about how the ancestor of birds first learned to fly. Here we provide new evidence suggesting that basal dromaeosaurid dinosaurs were four-winged animals and probably could glide, representing an intermediate stage towards the active, flapping-flight stage. The new discovery conforms to the predictions of early hypotheses that proavians passed through a tetrapteryx stage. 
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