GROUND-STATE PROPERTIES OF THE ONE-DIMENSIONAL SPIN-1/2 HEISENBERG-XY ANTIFERROMAGNET WITH COMPETING INTERACTIONS T. Tonegawa et I. HaradaJ. Phys. Colloques, 49 C8 (1988) C8-1411-C8-1412DOI: https://doi.org/10.1051/jphyscol:19888648
