Updated build system.

refs.bib

@@ -54,3 +54,13 @@
   year={1993},
   publisher={Springer New York}
 }
+@book{Folland,
+  title={Real Analysis: Modern Techniques and Their Applications},
+  author={Folland, G.B.},
+  isbn={9780471317166},
+  lccn={98037260},
+  series={Pure and Applied Mathematics: A Wiley Series of Texts, Monographs and Tracts},
+  url={https://books.google.ca/books?id=N8jVDwAAQBAJ},
+  year={1999},
+  publisher={Wiley}
+}