Kuzmina I N, Kuzmina E, Ekstrand K R
Department of Cariology and Endodontics, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
Community Dent Oral Epidemiol. 1995 Oct;23(5):266-70. doi: 10.1111/j.1600-0528.1995.tb00246.x.