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2. Effectiveness of copal resin varnish under amalgam restorations;Barber;J. Prosthet. Dent.,1964
3. The use of scanning electron microscopy in clinical dental research;Boyde;Br. Dent. J.,1969
4. The presence of bacteria in cavities filled with silicate cement and composite resin materials;Brännström;Swed. Dent. J.,1971