Stable entanglement in a quadripartite cavity optomechanicsFatemeh Mahmoudi Momenabadi, Hamid Reza Baghshahi, Mohammad Javad Faghihi and Sayyed Yahya MirafzaliEur. Phys. J. Plus, 136 1 (2021) 7DOI: https://doi.org/10.1140/epjp/s13360-020-00988-3