“…(Kohlmann and Alt, 2009), (Kim et al, 2013), (Vaddi et al, 2012), (Kutscher and Ott, 2006), or (b) the term is used but a different substantial functionality is addressed, e.g. (Mi Sun Ryu et al, 2006) or (c) the term is not used but the described concept partly includes functionality for the mentioned purpose, e.g. (Kohlborn et al, 2009), (Fleischer et al, 2005).…”