@article{JWSP:17b,
  author =	 {J. W. Simpson-Porco},
  title =	 {A Theory of Solvability for Lossless Power Flow Equations -- {P}art {II}: Conditions for Radial Networks},
  journal =	{{IEEE} Transactions on Control of Network Systems},
  year =	 2018,
  volume =	 {5},
  number =	 {3},
  pages =	 {1373-1385},
  pdf =		 {http://www.control.utoronto.ca/~jwsimpson/papers/2017b.pdf},
  doi =		 {10.1109/TCNS.2017.2711859},
  keywords =	 {Power Networks},
}