Wetter, Michael, and Elijah  Polak. "A convergent optimization method using pattern search algorithms with adaptive precision simulation." Building Services Engineering Research and Technology 25.4 (2004) 327-338.

Wetter, Michael, and Elijah  Polak. "A convergent optimization method using pattern search algorithms with adaptive precision simulation." Ed. Godfried  Augenbroe and Hensen, Jan. Proceedings of the 8th IBPSA Conference 2003: 1393-1400.