0185-2574 0185-2574 S0185-25742019000100339 10.19130/iifl.ecm.2019.53.975 Germany 00 00 2019 00 00 2019 53 339 343 1973 1983 1985 1987 1997 2006 2015 432-67 2008 1997 27 59-93