Solving Hierarchical Constraints over Finite Domains. - Martin Henz; Yun Fong Lim; Lua Seet Chong; Shi Xiao Ping; J. Paul Walser; Roland H. C. Yap (AI&M, 2000)

Solving Hierarchical Constraints over Finite Domains with Local Search. - Martin Henz; Roland H. C. Yap; Yun Fong Lim; Lua Seet Chong; J. Paul Walser; Shi Xiao Ping (Ann. Math. Artif. Intell., 2004)