address FIXMEs, add more refs

doc/paper/taler.bib

@@ -229,6 +229,22 @@
   url="http://web.cs.ucdavis.edu/~rogaway/papers/exact.pdf"
 }
 
+@article{martens2015practical,
+  title={Practical Divisible E-Cash.},
+  author={M{\"a}rtens, Patrick},
+  journal={IACR Cryptology ePrint Archive},
+  volume={2015},
+  pages={318},
+  year={2015}
+}
+
+@book{molander1998cyberpayments,
+  title={Cyberpayments and money laundering: Problems and promise},
+  author={Molander, Roger C and Mussington, David A and Mussington, David and Wilson, Peter A},
+  volume={965},
+  year={1998},
+  publisher={Rand Corporation}
+}
 
 
 @article{OneMoreInversion,