Division of Engineering and Applied Sciences, Harvard University, 29 Oxford St. Pierce 317, Cambridge, MA 02138 United States
Division of Engineering and Applied Sciences, Harvard University, 29 Oxford St. Pierce 317, Cambridge, MA 02138 United States; Department of Earth and Planetary Sciences, Harvard University, Oxford Street, Cambridge, MA 02138 United States
Option de Mecanique, Ecole Polytechnique and Corps des Mines, 60 Boulevard Saint-Michel 75272, Paris, Cedex 06 France