R. Sommer
发表
L A Whitaker,
L. Whitaker,
R. Sommer,
1986,
Ergonomics.
Joshua Summit,
Robert O. Sommer,
R. Sommer,
2000
.
Joshua Summit,
Robert Sommer,
R. Sommer,
1999
.
R. Sommer,
Joshua Summit,
1995
.
Joshua Summit,
Robert Sommer,
R. Sommer,
1998
.
Robert Sommer,
Hartmut Guenther,
Philip A. Barker,
1990,
Landscape Journal.
K. Kurani,
R. Sommer,
P. Barker,
1989
.
Robert Sommer,
Hartmut Guenther,
Philip A. Barker,
1993,
Arboriculture & Urban Forestry.
Hartmut Guenther,
Robert Sommer,
Christina L. Cecchettini,
1992
.
M. Tirrell,
R. Sommer,
Joshua Summit,
1994,
Arboriculture & Urban Forestry.