Andrew Barkley/ Paul W. Barkley
(4)
Andrew (Kansas State University Barkley USA),Paul W. (Washington State University and Oregon State University Barkley USA)
(2)
Andrew Barkley,Paul W. Barkley
(2)
JunJie Wu (EDT)/ Paul W. Barkley (EDT)/ Bruce A. Weber (EDT)
(2)
Paul W. Barkley/ Andrew Barkley
(2)