Bai, T. and Scherrer, P.H. 2001, in Proc. SOHO 10/GONG 2000
Workshop,
'Photospheric Flows in Sunspot Umbrae"
Bai, T., Scherrer, P.H., and Bogart, R.S. 1998, in Proceedings of
the SOHO 6/GONG 98 Workshop,
"The Evershed Effect: An MDI Investigation"