Spectral identification of the u-band variable sources in two LAMOST fields. - Cao, Tian-Wen; Yang, Ming; Wu, Hong; Zhang, Tian-Meng; Shi, Jian-Rong; Zhang, Hao-Tong; Yang, Fan; Zhao, Jing-Kun; Zhou, Xu; Fan, Zhou; Jiang, Zhao-Ji; Ma, Jun; et al. (Astrophysics & Space Science, 2016)