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Search for Variations of Fundamental Constants using Atomic Fountain ClocksMarion, H.; Pereira Dos Santos, F.; Abgrall, M.; Zhang, S.; Sortais, Y.; Bize, S.; Maksimovic, I.; Calonico, D.; Grünert, J.; Mandache, C.; Lemonde, P.; Santarelli, G.; Laurent, Ph.; Clairon, A.; Salomon, C. · Physical Review Letters · 2003