Optimal Algorithms for Tower of Hanoi Problems with Relaxed Placement Rules.

Yefim Dinitz Shay Solomon Optimal Algorithms for Tower of Hanoi Problems with Relaxed Placement Rules. 36-47 2006 conf/isaac/2006 ISAAC http://dx.doi.org/10.1007/11940128_6 db/conf/isaac/isaac2006.html#DinitzS06