Sigurd. Groennings
发表
H. Knight,
Sigurd. Groennings,
1954
.
Sigurd. Groennings,
1953
.
Sigurd. Groennings,
F. M. Nelsen,
1963
.
H. Knight,
Sigurd. Groennings,
F. T. Eggertsen,
1956
.
Sigurd. Groennings,
F. T. Eggertsen,
1961
.
Sigurd. Groennings,
F. T. Eggertsen,
J. J. Holst,
1960
.
Sigurd. Groennings,
A. Polgár,
J. J. Holst,
1962
.
Sigurd. Groennings,
F. T. Eggertsen,
1958
.