%0 Journal Article
%T Optical Spectra Evolution of BL Lac Objects
%A B. Z. Wang
%A J. J. Tian
%A Q. Cai
%A X. W. Bi
%A Z. Q. Ni
%J -
%D 2011
%U https://www.ias.ac.in/describe/article/joaa/032/01-02/0109-0112