krug et al. 2002, krug et al. 2002 p. 5, kraut et al. 2002, kraus et al. 2012, kraus et al. 2009, kraut et al. 1998, krause et al. 2012, klein et al. 2002, krueger et al. 2015, krausmann et al. 2009, kramer et al. 2004, kramer et al. 2012, kraemer et al. 2004, kramer et al. 2006, krauss et al. 2014, kriegbaum et al. 2015, krisberg et al. 1994, craik et al. 1996, douglas et al 1992
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