updating hyperlinks in references

tutorial00/doc/tutorial00.bib

@@ -17,7 +17,7 @@ year = {2009},
   author = 	 {K. Eriksson and D. Estep and P. Hansbo and C. Johnson},
   title = 	 {Computational Differential Equations},
   publisher = 	 {Cambridge University Press},
-  note =         {{\small\url{http://www.csc.kth.se/~jjan/private/cde.pdf}} },
+  note =         {{\small\url{http://www.csc.kth.se/~jjan/transfer/cde.pdf}} },
   year = 	 {1996},
 }
 
@@ -85,7 +85,7 @@ year = {2009},
 @Unpublished{BastianII,
   author = 		 {P. Bastian},
   title = 		 {Lecture Notes on Scientific Computing with Partial Differential Equations},
-  note = 		 {{\small\url{http://conan.iwr.uni-heidelberg.de/teaching/numerik2_ss2014/num2.pdf}} },
+  note = 		 {{\small\url{https://conan.iwr.uni-heidelberg.de/data/teaching/finiteelements_ws2017/num2.pdf}} },
   year = 	 {2014},
 }