1) Jensen, B., Bratthall, D.: A new method for the estimation of mutans streptococci in human saliva, J. Dent. Res., 68: 468-471, 1989.
2) Twetman, S., Mattiasson, A., Varela, R. J., Bratthall, D.: Mutans streptococci in saliva and dental caries in children living in a high and a low fluoride area, Oral microbiol. Immunol., 5: 169-171, 1990.
3) Gomez, I. D. R., Bratthall, D.: Sample, count, identify, and store the mutans strepto cocci, Scand. J. Dent. Res., 98: 106-111, 1990.