Evgueni N. Smirnov H. Jaap van den Herik Ida G. Sprinkhuizen-Kuyper Adaptable Boundary Sets. 2002 ISAIM http://rutcor.rutgers.edu/~amai/aimath02/PAPERS/42.pdf conf/isaim/2002 db/conf/isaim/isaim2002.html#SmirnovHS02