Statistics
Publications
45
Citations
2.1K
H-Index
26
Active since
1967
Publications per year
1967–2009
45
45
Automatic sleep stage classification using two-channel electro-oculography
Jussi Virkkala, Jóel Hasan, Alpo Värri et al. · Journal of Neuroscience Methods · 2007 · 129 citations
Daytime sleepiness: a risk factor in community life
Kirsti Martikainen, Jóel Hasan, Hélka Urponen et al. · Acta Neurologica Scandinavica · 1992 · 106 citations
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