G. Helfand
发表
M. Gallaher,
A. Rogozhin,
G. Helfand,
2010
.
G. Helfand,
1999
.
P. Berck,
G. Helfand,
2010
.
John B. Loomis,
Gloria E. Helfand,
G. Helfand,
2001
.
G. Helfand,
Changzheng Liu,
M. Shelby,
2019,
Energy policy.
R. Beach,
G. Helfand,
D. Greene,
2018,
Transportation research. Part A, Policy and practice.
R. Beach,
G. Helfand,
Lawrence Reichle,
2016
.
G. Helfand,
Yimin Liu,
M. Moore,
2007
.
G. Helfand,
M. Shelby,
Sharyn Lie,
2012
.
G. Helfand,
1995
.
G. Helfand,
J. Nassauer,
Joon Sik Park,
2006
.
G. Helfand,
L. J. Peyton,
1999
.
G. Helfand,
J. Rubin,
J. Loomis,
1991,
Journal of Forestry.
G. Helfand,
1993
.
Peter Berck,
Gloria E. Helfand,
P. Berck,
1990
.
K. Gillingham,
G. Helfand,
K. Small,
2014
.
G. Helfand,
Yimin Liu,
2012
.
G. Helfand,
Gloria E Helfand,
1991
.
Gregory A. Keoleian,
Alissa Kendall,
Gloria E. Helfand,
2008
.
P. Berck,
G. Helfand,
Tim A Maull,
2003
.
G. Helfand,
Brett W. House,
D. Larson,
1996
.
Gloria E. Helfand,
G. Helfand,
Brett W. House,
1995
.
G. Helfand,
J. Rubin,
1994
.
W. P. Darby,
C. L. Clark,
C L Clark,
1981
.
G. Helfand,
Reid Dorsey-Palmateer,
2015,
Journal of Benefit-Cost Analysis.
Ann Wolverton,
Gloria Helfand,
G. Helfand,
2011
.
G. Helfand,
R. Howitt,
H. Kim,
1998
.
Michael D. Lepech,
R. F. Chandler,
Gregory A. Keoleian,
2005
.
R. Beach,
G. Helfand,
D. Greene,
2018,
Transportation research. Part A, Policy and practice.
P. Berck,
G. Helfand,
2017
.