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Protein Ontology: a controlled structured network of protein entities.
Natale DA, Arighi CN, Blake JA, Bult CJ, Christie KR, Cowart J, D'Eustachio P, Diehl AD, Drabkin HJ, Helfer O, Huang H, Masci AM, Ren J, Roberts NV, Ross K, Ruttenberg A, Shamovsky V, Smith B, Yerramalla MS, Zhang J, AlJanahi A, Çelen I, Gan C, Lv M, Schuster-Lezell E, Wu CH. Natale DA, et al. Among authors: helfer o. Nucleic Acids Res. 2014 Jan;42(Database issue):D415-21. doi: 10.1093/nar/gkt1173. Epub 2013 Nov 21. Nucleic Acids Res. 2014. PMID: 24270789 Free PMC article.
[Sports and health in our environment].
Helfer O. Helfer O. Med Monatsschr. 1972 Aug;26(8):349-50. Med Monatsschr. 1972. PMID: 5052281 German. No abstract available.