Don Osterbrock, 2002, Rev Mex AA 12, 1

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Bahcall, J. & Kozlovsky, B-Z, 1969, ApJ, 155, 1077 Davidson, K. 1972, ApJ, 171, 213 MacAlpine, G. 1974, ApJ, 193, 37 Shields, G.A. 1974, 191, 209 Netzer ….. Davidson, K. & Netzer, H. 1979, RvMP, 51, 715

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Hagai’s first ten years could be done in 78 seconds today