Peter E. Valk
发表
Lawrence E. Crooks,
Leon Kaufman,
J C Watts,
1986
.
David W. Townsend,
Dale L. Bailey,
Peter E. Valk,
2006
.
Michael E. Phelps,
Daniel H.S. Silverman,
Peter E. Valk,
2002
.
David W. Townsend,
Peter E. Valk,
Michael Maisey,
2008
.
Michael E. Phelps,
Heiko Schöder,
Peter E. Valk,
2001
.