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International EMS Systems: the Nordic countries.
Langhelle A, Lossius HM, Silfvast T, Björnsson HM, Lippert FK, Ersson A, Søreide E. Langhelle A, et al. Resuscitation. 2004 Apr;61(1):9-21. doi: 10.1016/j.resuscitation.2003.12.008. Resuscitation. 2004. PMID: 15081176
Inspiratory impedance threshold valve during CPR.
Langhelle A, Strømme T, Sunde K, Wik L, Nicolaysen G, Steen PA. Langhelle A, et al. Resuscitation. 2002 Jan;52(1):39-48. doi: 10.1016/s0300-9572(01)00442-7. Resuscitation. 2002. PMID: 11801347
Reducing CPR artefacts in ventricular fibrillation in vitro.
Langhelle A, Eftestøl T, Myklebust H, Eriksen M, Holten BT, Steen PA. Langhelle A, et al. Resuscitation. 2001 Mar;48(3):279-91. doi: 10.1016/s0300-9572(00)00259-8. Resuscitation. 2001. PMID: 11278094 English, Portuguese.