Suraka Bhattacharjee and  Ranjan Chaudhury,  Effective Charge Coupling in Low Dimensional Doped Quantum Antiferromagnets.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2020, vol. 158(2). 23 - 29
    [viewed 27 May 2020]. Available from: https://publications.waset.org/pdf/10011050.