Non-uniform magnetic field impact on thermomagnetic convection of paramagnetic air in a permanent magnet-inserted horizontal annulusEr Shi, KangKang Li, Changwei Jiang, Yecong He and Mousa MohammadpourfardEur. Phys. J. Plus, 136 2 (2021) 157DOI: https://doi.org/10.1140/epjp/s13360-021-01136-1