“Supersolid” phase in spin-1 easy-plane antiferromagnetic Y. A. Fridman, O. A. Kosmachev and P. N. Klevets Eur. Phys. J. B, 81 2 (2011) 185-196 Published online: 25 May 2011 DOI: 10.1140/epjb/e2011-10859-9