Thermodynamic analysis for Non-linear system (Van-der-Waals EOS) with viscous cosmology Shouvik Sadhukhan, Alokananda Kar and Surajit Chattopadhay Eur. Phys. J. C, 81 10 (2021) 934 Published online: 21 October 2021 DOI: 10.1140/epjc/s10052-021-09738-w