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van den Berg-Emons H, Bussmann J, Balk A, Keijzer-Oster D, Stam H.van den Berg-Emons H, et al.Phys Ther. 2001 Sep;81(9):1502-11.Phys Ther. 2001.PMID: 11688587
Bonsel GJ, Erdman RA, van der Mast RC, Balk AH, van der Maas PJ.Bonsel GJ, et al. Among authors: balk ah.Ned Tijdschr Geneeskd. 1990 Feb 3;134(5):227-31.Ned Tijdschr Geneeskd. 1990.PMID: 2304579Dutch.
Koning L, Pas SD, de Man RA, Balk AH, de Knegt RJ, ten Kate FJ, Osterhaus AD, van der Eijk AA.Koning L, et al. Among authors: balk ah.J Heart Lung Transplant. 2013 Jan;32(1):78-85. doi: 10.1016/j.healun.2012.10.008.J Heart Lung Transplant. 2013.PMID: 23260707