tex: add some sources

ma/safety_reset.bib

@@ -648,3 +648,31 @@
 	year = {2016}
 }
 
+@article{perez01,
+	author = {Noelia Uribe-P{\'e}rez and Luis Hern{\'a}ndez and David de la Vega and Itziar Angulo},
+	comment = {Questionable publisher but seems good-quality, well-researched. Maybe not published elsewhere since it's just an industry/legislative review article?},
+	doi = {10.3390/app6030068},
+	journaltitle = {Applied Sciences},
+	month = feb,
+	number = {3},
+	organization = {MDPI},
+	pages = {68},
+	title = {State of the Art and Trends Review of Smart Metering in Electricity Grids},
+	volume = {6},
+	x-color = {#cc3300},
+	year = {2016}
+}
+
+@article{urtasun01,
+	author = {Andoni Urtasun and Pablo Sanchis and David Barricarte and Luis Marroyo},
+	comment = {has lots of self-citations by urtasun},
+	journaltitle = {Renewable Energy},
+	month = jan,
+	pages = {325--336},
+	publisher = {Elsevier},
+	title = {Energy management strategy for a battery-diesel stand-alone system with distributed PV generation based on grid frequency modulation},
+	url = {http://dx.doi.org/10.1016/j.renene.2013.12.020},
+	volume = {66},
+	year = {2014}
+}
+

ma/safety_reset.tex

@@ -154,7 +154,7 @@ against attacks and simplify updates. Combined with the small market sizes in sm
     cost lies in the meter's software % TODO cite?
     There exist multiple competing standards applicable to various parts of a smart electricity meter. In addition,
     most countries have their own certification regimen\cite{cenelec01}. This complexity creates a large development
-    burden for new market entrants.
+    burden for new market entrants\cite{perez01}.
 }
 this produces a high cost pressure on the software development process for smart electricity meters.
 
@@ -478,6 +478,12 @@ simple to reduce attack surface there.
 \subsection{Landline IP}
 \subsection{IP-based wireless systems}
 \subsection{Frequency modulation as a communication channel}
+
+For our system, we chose grid frequency modulation (henceforth GFC) as a low-bandwidth uni-directional communications channel. 
+Compared to traditional PLC GFC requires no additional hardware, works reliably throughout the grid and is harder to
+manipulate by a malicious actor. 
+% FIXME \cite{urtasun01}
+
 \subsubsection{The frequency dependance of grid frequency}
 \subsubsection{Control systems coupled to grid frequency}
 \subsubsection{Avoiding dangerous modes}
@@ -596,9 +602,6 @@ correctly configure than it is to simply use separate hardware and secure the in
 \chapter{Economic viability of countermeasures}
 \section{Attack cost}
 \section{Countermeasure cost}
-\section{Conclusion}
-
-\chapter{The ethics and security implications of centralized crackdown on energy theft}
 
 % FIXME maybe include a standard for the technical side of a safety reset system here, e.g. in the style of an IETF draft?