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At the end of the sixties, radio interferometry was wellestablished as one of the ways to image the radio sky (Thompson et al. 2001). Ryle (Ryle & Hewish 1960) was soon to win the Nobel prize (along with Hewish – cited for pulsars) for his development of “aperture synthesis”. The overall theory – the van Cittert-Zernike theorem and the Fourier transform – was understood and used from day to day in processing observations from radio interferometric telescopes.

Hogbom's CLEAN algorithm. Impact on astronomy and beyond