Baran, O.R. and Verkholyak, T.M. 2019. Two-Dimensional Spin-1/2 J1 − J′1 − J2 Heisenberg Model within Jordan–Wigner Transformation. Ukrainian Journal of Physics. 61, 7 (Jan. 2019), 597. DOI:https://doi.org/10.15407/ujpe61.07.0597.