Billy P. Helms

发表

Robert M. Clark, Billy P. Helms, 1970 .
Robert M. Clark, Billy P. Helms, 1971 .
Robert M. Clark, Billy P. Helms, 1972 .
Robert M. Clark, Billy P. Helms, 1971 .
Robert M. Clark, Billy P. Helms, 1978 .
Robert M. Clark, Billy P. Helms, 1972 .
Billy P. Helms, B. Helms, William H. Jean, 1983, Journal of Financial and Quantitative Analysis.
Billy P. Helms, James T. Moser, B. Helms, 1990 .