H. F. Helmken

Evidence for the detection of gamma rays from Centaurus A at gamma-ray energies above 300 GeV

J. E. Grindlay, H. F. Helmken, R. H. Brown et al. · The Astrophysical Journal · 1975 · 96 citations

Natural Sciences, Astronomy, Physics +14

Explorer XI Experiment on Cosmic Gamma Rays.

W. L. Kraushaar, G. W. Clark, G. P. Garmire et al. · The Astrophysical Journal · 1965 · 90 citations

Natural Sciences, Astronomy, Physics +9

Performance analysis of coherent DS-CDMA systems in a Nakagami fading channel with arbitrary parameters

George P. Efthymoglou, Valentine A. Aalo, H. F. Helmken · IEEE Transactions on Vehicular Technology · 1997 · 85 citations

Engineering, Communication, Electrical Engineering +17

Detection of High-Energy Gamma Rays from the Crab Nebula

G. G. Fazio, H. F. Helmken, E. O’Mongáin et al. · The Astrophysical Journal · 1972 · 71 citations

Natural Sciences, Astronomy, Physics +9

Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV

J. E. Grindlay, H. F. Helmken, R. H. Brown et al. · The Astrophysical Journal · 1975 · 57 citations

Natural Sciences, Astronomy, Physics +9