R. Billings
发表
D. Agthe,
R. Billings,
J. M. Dworkin,
1988
.
R. Billings,
2003
.
D. Agthe,
R. Billings,
2003
.
D. Agthe,
R. Billings,
1982
.
R. Billings,
Brenda González-Hermosillo,
Ceyla PazarbaÅŸioÄŸlu,
1997
.
Brenda González-Hermosillo,
R. Billings,
Ceyla Pazarba_1o lu,
1996,
SSRN Electronic Journal.
R. Bruce Billings,
Donald E. Agthe,
D. Agthe,
1980
.
R. Bruce Billings,
Donald E. Agthe,
D. Agthe,
1998
.
S. Ince,
D. Agthe,
R. Billings,
2000
.
R. Billings,
1990
.
R. Bruce Billings,
Donald E. Agthe,
D. Agthe,
1980
.
R. Billings,
1982
.
R. Bruce Billings,
Donald E. Agthe,
K. Raffiee,
1986
.
D. Agthe,
R. Billings,
2000
.
D. Agthe,
R. Billings,
James R. Marchand,
1996
.
Nathan Buras,
R. Bruce Billings,
Donald E. Agthe,
2003
.
R. Billings,
1969
.
William C. Horrace,
R. Bruce Billings,
Donald E. Agthe,
1999
.
D. Agthe,
R. Billings,
1987
.
R. Billings,
Donald E. Acthe,
1979
.