R. Penn
发表
M. Cullen,
S. R. Jones,
P. D. de Takats,
1996,
Clinical oncology (Royal College of Radiologists (Great Britain)).
P. Johnson,
D. Katz,
J. Pester,
1979,
Journal of surgical oncology.
Robert Penn,
R. Penn,
1967,
Canadian Psychiatric Association journal.
R. Penn,
2005
.