Fabio Martinelli Alistair Sinclair Dror Weitz The Ising Model on Trees: Boundary Conditions and Mixing Time. 628-639 2003 conf/focs/2003 FOCS http://csdl.computer.org/comp/proceedings/focs/2003/2040/00/20400628abs.htm db/conf/focs/focs2003.html#MartinelliSW03