Matthew J. Hancock, Department of Mathematics, MIT Bldg 2, Room 339, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
Blake J. Landry, Department of Civil & Environmental Engineering, University of Illinois, Urbana-Champaign, IL 61801, United States
Chiang C. Mei, Department of Civil & Environmental Engineering, MIT Bldg 1, Room 346, Massachusetts Institute of Technology, Cambridge, MA 02139, United States