remove "&"

thesis.bbl

@@ -12,4 +12,9 @@
 \newblock \emph{Analysis}.
 \newblock Oldenbourg Wissenschaftsverlag GmbH, 2007
 
+\bibitem[TP85]{Tenenbaum1985}
+\textsc{Tenenbaum}, Morris ; \textsc{Pollard}, Harry:
+\newblock \emph{Ordinary Differential Equations}.
+\newblock Harper and Row, Publishers, Inc., 1985
+
 \end{thebibliography}

thesis.bib

@@ -72,7 +72,7 @@
 
 @book{Tenenbaum1985,
   author    = {Morris Tenenbaum and Harry Pollard},
-  publisher = {Harper & Row, Publishers, Inc.},
+  publisher = {Harper and Row, Publishers, Inc.},
   title     = {Ordinary Differential Equations},
   year      = {1985}
 }