Wide field astronomy & technology for the square kilometre array : proceedings of the conference held at the Château de Limelette, Belgium, 4-6 November 2009 / ed.: S.A. Torchinsky ... [et al.]50 years Westerbork Radio Observatory : a continuous journey to discoveries and innovations / Richard Strom, Arnold van Ardenne, Steve Torchinsky (eds.) ; photography Harm-Jan Stiepel