Mu He Jin Xie 0001 Jian Yang 0003 Improving Unsupervised Learning of Monocular Depth and Ego-Motion via Stereo Network. 421-433 2021 PRCV (2) https://doi.org/10.1007/978-3-030-88007-1_35 conf/prcv/2021-2 db/conf/prcv/prcv2021-2.html#HeXY21