Li Li Xiao Long Liansheng Zhuang Shafei Wang Learn the Approximation Distribution of Sparse Coding with Mixture Sparsity Network. 387-398 2021 PRCV (4) https://doi.org/10.1007/978-3-030-88013-2_32 conf/prcv/2021-4 db/conf/prcv/prcv2021-4.html#LiLZW21