add url for rfc 1855

report/literature.bib

@@ -4,7 +4,8 @@
     author = {S. Hambridge},
     organization = {IETF},
     title = {RFC 1855: Netiquette Guidelines},
-    year = {1995}
+    year = {1995},
+    note = {\url{https://tools.ietf.org/html/rfc1855}}
 
 }