Investigation of entropy generation in stratified MHD Carreau nanofluid with gyrotactic microorganisms under Von Neumann similarity transformationsRahila Naz, Sana Tariq, Muhammad Sohail and Zahir ShahEur. Phys. J. Plus, 135 2 (2020) 178DOI: https://doi.org/10.1140/epjp/s13360-019-00069-0