Gregory L. Direnzi
发表
Naresh K. Amineni,
Abraham Engeda,
William C. Hohlweg,
1996
.
Abraham Engeda,
Gregory L. Direnzi,
Yunbae Kim,
2001
.
William C. Hohlweg,
Gregory L. Direnzi,
Ronald H. Aungier,
1993
.
Gregory L. Direnzi,
A. Engeda,
Yunbae Kim,
2003
.