Paul E. J. Nulsen
发表
Heinz Andernach,
H. Andernach,
P. Nulsen,
2009,
0911.0409.
Brian R. McNamara,
Michael W. Wise,
Laurence P. David,
2011,
1102.5397.
Brian R. McNamara,
University of Amsterdam,
CfA,
2007
.
Claude R. Canizares,
G. C. Stewart,
A. C. Fabian,
1984
.
H. Böhringer,
P. Nulsen,
Hans Böhringer,
1995
.