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[Desire for esthetics drove on research].
Helfgen EH. Helfgen EH. Zahnarztl Mitt. 1991 Nov 1;81(21):2146-50. Zahnarztl Mitt. 1991. PMID: 1817406 German. No abstract available.
[Genotype in dental function morphology].
Helfgen EH, Stammen U. Helfgen EH, et al. Dent Labor (Munch). 1991 Jun;39(6):793-8. Dent Labor (Munch). 1991. PMID: 1936393 German. No abstract available.
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