Indian Institute of Astrophysics – A Brief History, Solar Observatory at Kodaikanal, retrieved 3/13/2007.[1]
nasa.gov
cdaw.gsfc.nasa.gov
Swarup Govind, "Historical perspective and research centres in India in the
fields of solar astronomy and Sun-Earth relationship," National Centre for Radio Astrophysics, TIFR, Pune 411007, India. retrieved 3/13/2007 [2]