++graphs ++ intro

doc/refs/refs.bib

@@ -48,3 +48,18 @@
   title =     {IPv6 transition mechanism},
   howpublished = {\url{https://en.wikipedia.org/wiki/IPv6_transition_mechanism}},
   note =      {As requested on 2019-08-08}}
+
+@Misc{_implem_your_switc_target_with_bmv2,
+  author =    {BMV2},
+  title =     {IMPLEMENTING YOUR SWITCH TARGET WITH BMv2},
+  howpublished = {\url{http://www.bmv2.org/}}}
+
+@Misc{netfpga:_p4_netpf_public_github,
+  author =    {NetFPGA},
+  title =     {P4-NetPFGA-Public repository at Github},
+  howpublished = {\url{https://github.com/NetFPGA/P4-NetFPGA-public}}}
+
+@Misc{networks:_tofin,
+  author =    {Barefoot Networks},
+  title =     {Tofino2},
+  howpublished = {\url{https://barefootnetworks.com/products/brief-tofino-2/}}}