Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system
Journal article published in 1999 by
F. A. Aharonian,
A. G. Akhperjanian,
M. Andronache,
J. A. Barrio 
,
K. Bernlöhr,
H. Bojahr,
I. Calle,
J. L. Contreras,
J. Cortina,
A. Daum,
T. Deckers,
S. Denninghoff,
Fonseca,
J. C. Gonzalez,
N. Götting
and other authors.
,
K. Bernlöhr,
H. Bojahr,
I. Calle,
J. L. Contreras,
J. Cortina,
A. Daum,
T. Deckers,
S. Denninghoff,
Fonseca,
J. C. Gonzalez,
N. Götting
and other authors.
