J. Willems
发表
P. Poschlod,
J. Bakker,
U. Grandin,
1998
.
Peter Poschlod,
P. Poschlod,
M. WallisDeVries,
2002
.
H. Olff,
M. Zobel,
J. Bakker,
1996
.
R. Bobbink,
J. Willems,
R. Bobbink,
1987
.
J. Willems,
L. Bik,
1998
.
J. Willems,
2001
.
J. Willems,
1995,
Folia Geobotanica.
J. Willems,
K. Huijsmans,
1994
.
J. Willems,
Simia Lamk,
1982
.
ESTABLISHMENT AND DEVELOPMENT OF A POPULATION OF ORCHIS SIMIA LAMK. IN THE NETHERLANDS, 1972 TO 1981
J. Willems,
1982
.
S. Güsewell,
B. Beltman,
J. Willems,
2007
.
R. Bobbink,
J. Willems,
K. C. D. Dubbelden,
1989
.
R. Brys,
H. Jacquemyn,
M. Hermy,
2007
.
J. Willems,
1982,
Vegetatio.
M. Sykes,
E. Maarel,
R. Peet,
1994,
Folia Geobotanica et Phytotaxonomica.
J. Willems,
1985,
Vegetatio.
R. Brys,
H. Jacquemyn,
M. Hermy,
2005
.
J. Willems,
2004,
Vegetatio.
H. During,
J. Willems,
1986
.
E. Dorland,
J. Willems,
2000
.
J. Andel,
J. Willems,
E. Dijk,
1997
.
J. Morris,
T. Wells,
J. Willems,
1993
.
J. Willems,
1988
.
R. Bobbink,
J. Willems,
N. Smits,
2008
.
J. Willems,
M. Lahtinen,
1997
.
R. Aerts,
C. V. D. Vijver,
J. Willems,
1995
.
M. Zobel,
J. Bakker,
J. Willems,
1996
.
R. Peet,
J. Willems,
L. Bik,
1993
.
H. During,
J. Willems,
1984,
Vegetatio.
D. Whigham,
J. Willems,
2003
.
J. Willems,
C. Melser,
1998
.
R. Bobbink,
J. Willems,
1991
.
J. Schreurs,
R. Bobbink,
H. During,
1987,
Folia Geobotanica et Phytotaxonomica.
R. Peet,
J. Fridley,
J. Willems,
2006,
The American Naturalist.
R. Bobbink,
J. Willems,
1993,
Biodiversity & Conservation.
J. Willems,
M. Nieuwstadt,
1996
.
P. Kindlmann,
D. Whigham,
J. Willems,
2002
.
H. During,
J. Willems,
H. J. Verkaar,
1985
.
J. Willems,
1983,
Vegetatio.
J. Ellers,
J. Willems,
1996
.
R. Bobbink,
J. Willems,
L. Bik,
1988
.
J. Mitchley,
J. Willems,
1995,
Vegetatio.
M. Zobel,
J. Bakker,
J. Willems,
1996
.