1. Diagnostic efficiency of fingerprint and blood group differences in a series of twins;Allen;Acta Geneticae Medicae et Gemellologiae,1968
2. Evaluation of zygosity diagnosis in twin pairs below age seven by means of a mailed questionnaire;B��nnelykke;Acta Geneticae Medicae et Gemellologiae,1989
3. Is Weinberg's method valid?;Bulmer;Acta Geneticae Medicae et Gemellologiae,1976
4. Studies on similarity diagnosis in twins with the aid of mailed questionnaires;Cederl��f;Acta Genetica Statistica Medica (Basel),1961
5. Zygosity determination in newborn twins using DNA variants;Derom;Journal of Medical Genetics,1985