Helene E. Unland
发表
Paul R. Houser,
William James Shuttleworth,
W. J. Shuttleworth,
1996
.
Helene E. Unland,
W. Ojeda,
Pedroza Hector Quiñones,
1999
.
P. W. Scott,
W. J. Shuttleworth,
O. Sen,
1998
.