Detection of Three Anaerobes Collected Under the Opercula of the Affected Teeth in Pericoronitis by Polymerase Chain Reaction
应用聚合酶链反应检测冠周炎盲袋内的厌氧菌
On the Classification and Evolution of Gastropod Opercula Fossils
腹足类口盖化石分类与演化探讨
opercula