Updated README information.

README.md

@@ -2,8 +2,12 @@
 
 ## License
 
-This software is released under GNU General Public License, Version 3. The full license text is provided in the
-file license.txt included in this repository or can be obtained from http://www.gnu.org/licenses/
+Copyright (c) 2023, Tilo Arens, Roland Griesmaier
+
+This software is released under GNU General Public License, Version 3.
+The full license text is provided in the file LICENSE included in this repository 
+or can be obtained from http://www.gnu.org/licenses/
+
 
 ## Content of this project
 
@@ -22,8 +26,11 @@ The code is in the Matlab programming language.
 ## Requirements
 
 The following additional software is necessary to run the code in this project:
-- [ ] a recent version of Matlab,
-- [ ] the BIEPack Matlab library for solving boundary integral equations (TODO: Provide link),
+- [ ] a recent version of Matlab
+- [ ] the BIEPack Matlab library for solving boundary integral equations
+  available from https://git.scc.kit.edu/ge8413/bempp-experiments and all
+  dependent software to activate the evaluation of periodic Green's
+  functions
 - [ ] the export_fig Matlab package, available from https://github.com/altmany/export_fig
 
 Set the Matlab path so that the BIEPack files and export_fig will be found.