NuSTAR discovery of a luminosity dependent cyclotron line energy in Vela X-1
Journal article published in 2014 by
Felix Fuerst,
K. Pottschmidt,
J. Wilms,
J. Tomsick,
M. Bachetti 
,
S. E. Boggs,
F. Christensen,
W. W. Craig,
B. Grefenstette,
C. J. Hailey,
F. Harrison,
K. Madsen,
J. M. Miller,
D. Stern,
D. Walton
and other authors.
,
S. E. Boggs,
F. Christensen,
W. W. Craig,
B. Grefenstette,
C. J. Hailey,
F. Harrison,
K. Madsen,
J. M. Miller,
D. Stern,
D. Walton
and other authors.
