TY - RPRT TI - Structural changes in exposed human cementum. II. Electron microscopic observations. AU - G C Armitage AU - T M Christie PY - 1973 DO - 10.1111/j.1600-0765.1973.tb00769.x UR - https://pubmed.ncbi.nlm.nih.gov/4128640/ ID - 4128640 ER -