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KF Walker; AL Cohen; SH Walker; KM Allen; DL Baines; JG Thornton (13 de febrero de 2014). «The dangers of the day of birth». British Journal of Obstetrics & Gynaecology121 (6): 714-8. PMID24521517. doi:10.1111/1471-0528.12544.
Soreide, Kjetil; Christian Lycke Ellingsen; Vibeke Knutson (May 2007). «How Dangerous is BASE Jumping? An Analysis of Adverse Events in 20,850 Jumps From the Kjerag Massif, Norway». The Journal of Trauma: Injury, Infection, and Critical Care62 (5): 1113-1117. ISSN0022-5282. PMID17495709. doi:10.1097/01.ta.0000239815.73858.88.
Soreide, Kjetil; Christian Lycke Ellingsen; Vibeke Knutson (May 2007). «How Dangerous is BASE Jumping? An Analysis of Adverse Events in 20,850 Jumps From the Kjerag Massif, Norway». The Journal of Trauma: Injury, Infection, and Critical Care62 (5): 1113-1117. ISSN0022-5282. PMID17495709. doi:10.1097/01.ta.0000239815.73858.88.
KF Walker; AL Cohen; SH Walker; KM Allen; DL Baines; JG Thornton (13 de febrero de 2014). «The dangers of the day of birth». British Journal of Obstetrics & Gynaecology121 (6): 714-8. PMID24521517. doi:10.1111/1471-0528.12544.
Soreide, Kjetil; Christian Lycke Ellingsen; Vibeke Knutson (May 2007). «How Dangerous is BASE Jumping? An Analysis of Adverse Events in 20,850 Jumps From the Kjerag Massif, Norway». The Journal of Trauma: Injury, Infection, and Critical Care62 (5): 1113-1117. ISSN0022-5282. PMID17495709. doi:10.1097/01.ta.0000239815.73858.88.