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1994. HELENE, Paulo, ARMELIN, Hugo S., DANTAS, Francisco A. S., FIGUEIREDO, Antonio D., SILVA, Maristela G., TANGO, Carlos E. S. Shotcrete permeability – considerations on the durability of tunnel linings In: Symposium honoring P. Kumar Mehta on durability of concrete, 1994, Nice.  Anais do Symposium honoring P. Kumar Mehta on durability of concrete.

1994. HELENE, Paulo & SBRIGHI NETO, Cláudio. The diagenic process and its application in the production of cementious construction materials In: First International conference on alkaline cements and concretes, 1994, Kiev.  Anais do First International conference on alkaline cements and concretes.