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@ARTICLE{arqueros1999graal,
author = {Arqueros, F and Ballestrin, J and Berenguel Soria, Manuel and Borque, D M and Camacho, E F and Diaz, M and Gebauer, H J and Plaga, R and Portocarrero, C E},
title = {{The GRAAL project}},
journal = {Proc. 26. ICRC, Salt Lake City, Utah},
volume = {5},
year = {1999}
}