update 2019/2020

Hong-Phuc Bui

2019-10-06 3be6e236f6bc89d7596b23a18848e53b4729611a

 literatur.bib

@@ -154,3 +154,10 @@
  url={http://www.ctan.org/pkg/longtable}
}


@online{wikibooks:Source_Code_Listings,
    author={WikiBooks},	 
    title={LaTeX/Source Code Listings},
    url={https://en.wikibooks.org/wiki/LaTeX/Source_Code_Listings},
    date={2018-10-15}
}