N. T. Thang and P. T. T. Nga, Néel State in the Fermionized Spin 1/2 Heisenberg Antiferromagnet on Hypercubic and Triangular Lattices, Comm. Phys. 22 (2012) 33–43. DOI: https://doi.org/10.15625/0868-3166/22/1/631.