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Tajar، Abdelouahid؛ O'Connell، Matthew D L؛ Mitnitski، Arnold B؛ O'Neill، Terence W؛ Searle، Samuel D؛ Huhtaniemi، Ilpo T؛ Finn، Joseph D؛ Bartfai، György؛ Boonen، Steven؛ Casanueva، Felipe F؛ Forti، Gianni؛ Giwercman، Aleksander؛ Han، Thang S؛ Kula، Krzysztof؛ Labrie، Fernand؛ Lean، Michael E J؛ Pendleton، Neil؛ Punab، Margus؛ Silman، Alan J؛ Vanderschueren، Dirk؛ Rockwood، Kenneth؛ Wu، Frederick C W؛ European Male Aging Study Group (مايو 2011). "Frailty in relation to variations in hormone levels of the hypothalamic-pituitary-testicular axis in older men: results from the European male aging study". Journal of the American Geriatrics Society. ج. 59 ع. 5: 814–821. DOI:10.1111/j.1532-5415.2011.03398.x. ISSN:1532-5415.