Alternating-spin S = 3/2 and σ = 1/2 Heisenberg chain with isotropic three-body exchange interactions Nedko B. Ivanov, Svetozara I. Petrova and Jürgen Schnack Eur. Phys. J. B, 89 5 (2016) 121 Published online: 12 May 2016 DOI: 10.1140/epjb/e2016-70057-y