By Blair, Roger D., Lafontaine, Francine
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By Gromov, Mikhail, Lafontaine, Jacques, Pansu, Pierre, Katz, M., Pansu, P., Semmes, S., Bates, S. M.
By Warner, Janine, Lafontaine, David, Andron, Lee
By Tobin, Paul, Lafontaine, Thierry
