Sotomayor-Beltran, C., Sobey, C., Hessels, J. W. T., de Bruyn, G., Noutsos, A., Alexov, A., et al. (2013). Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes. Astronomy & Astrophysics, 552: A58, pp. 1-13. doi:10.1051/0004-6361/201220728.