2588-0934 2588-0934 S2588-09342020000200127 10.37785/nw.v4n2.a8 France 00 12 2020 00 12 2020 4 2 127 149

1977 32-51 1976 2019 1985 2004 2013 1985 2004 2007 2014 2014 1977 2015 1964 2003 1978 2004 2010 2015 1965 1926 1954