William Thompson and Donald Billings, 'Observations Bearing on the Kippenhahn-Schluter Quiescent Prominence Model' (1967) Astrophysical Journal volume 149 page 269-273 – see http://articles.adsabs.harvard.edu/full/1967Apj…149..269T/0000270.000…. … William Thompson notes the article on seasons of the Sun recently made use of data at the High Altitude Observatory in Climax, Colorado, which the article above, going back to 1967, did likewise.
William Thompson has compiled a very large list of catastrophic papers and articles he has accumulated over the years, which would be an excellent resource to any serious researcher on the subject. He has suggested we post a link on our web site – which is under discussion.