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Deutsche Zahnarztliche Zeitschrift|April 1, 1976
[Hygiene in dental practice-- wish and reality]J P Engelhardt, H FiskvatnZentralblatt Fur Bakteriologie, Mikrobiologie Und Hygiene. Serie B, Umwelthygiene, Krankenhaushygiene, Arbeitshygiene, Praventive Medizin|December 1, 1986
[Dental prostheses and dental impressions from a hygienic viewpoint]J P EngelhardtPageof 1