physica status solidi (b)Unusual Quantum Phase in Exactly Solvable Doubly Decorated Ising-Heisenberg ModelsJozef Strečka, M JAURPublished Oct 1, 2002• 18 citationsPublisherDOI10.1002/1521-3951(200210)233:3<r12::aid-pssb999912>3.0.co;2-2