WIP: Fixed missing biblio refs

contributions/sd_storm2/biblio.bib

@@ -22,6 +22,18 @@
   note = {\url{https://sdm.lbl.gov/srm-wg/doc/SRM.v2.2.html}}
 }
 
+@misc{ref:webdav,
+  title = {{HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)}},
+  year = 2007,
+  note = {\url{https://tools.ietf.org/html/rfc4918}}
+}
+
+@misc{ref:gitflow,
+  title = {{Gitflow Workflow}},
+  note = {\url{https://it.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow}},
+  urldate = {2019-07-08}
+}
+
 @misc{ref:grpc,
   title = {{gRPC}},
   note = {\url{https://grpc.io}},

contributions/sd_storm2/main.tex

@@ -192,7 +192,7 @@ The following principles have driven the StoRM 2 development work.
 \begin{itemize}
 
     \item The source code will be hosted on a Git repository hosted on the INFN
-      Gitlab service, and the development will follow the Git-flow~\cite{gitflow} inspired
+      Gitlab service, and the development will follow the Git-workflow~\cite{ref:gitflow} inspired
       branching model used with success for other components developed by the
       team (e.g., VOMS, INDIGO IAM, StoRM);