-Copyright (C) Bruno Haible 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008.
-Copyright (C) Richard B. Kreckel 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011.
-Copyright (C) Alexei Sheplyakov 2008, 2010.
+Copyright (C) Bruno Haible 1995 - 2019.
+Copyright (C) Richard B. Kreckel 2000 - 2019.
+Copyright (C) Alexei Sheplyakov 2008 - 2010.