P. Spies
发表
P. Spies,
2014
.
P. Spies,
2012
.
P. Spies,
1973
.
P. Spies,
1994
.
P. Spies,
J. Sachs,
2013
.
P. Spies,
2011
.
T. Kleynhans,
P. Spies,
1994
.
P. Spies,
B. Bester,
1975
.
P. Spies,
1983,
Studies in Economics and Econometrics.