scholarly article by Sean McGrail published in March 1988

article published in 1994

scholarly article by Sean McGrail published in November 1983

scientific article published in September 1975

scholarly article by Sean McGrail published in June 1985

scholarly article by Sean McGrail published in June 1990

scholarly article by Sean McGrail published in March 1989

scientific article published in January 1979

scientific article published in January 1981

scientific article published in December 1979

scientific article published in May 1979

scholarly article by Sean McGrail published in November 1989

scientific article published in January 1987

scientific article published in February 1985