Thi Hien Duong, T. et al. 2018. Exploiting Nonnegative Matrix Factorization with Mixed Group Sparsity Constraint to Separate Speech Signal from Single-channel Mixture with Unknown Ambient Noise. EAI Endorsed Transactions on Context-aware Systems and Applications. 4, 13 (Mar. 2018), e5. DOI:https://doi.org/10.4108/eai.14-3-2018.154342.