by Miilunpalo, Seppo, Vuori, Ilkka, Oja, Pekka, Pasanen, Matti, Urponen, Helka
Published in Journal of clinical epidemiology (01.05.1997)

by Martikainen, Kirsti, Partinen, Markku, Hasan, Joel, Laippala, Pekka, Urponen, Helka, Vuori, Ilkka
Published in Sleep medicine (01.05.2003)

by Urponen, Helka, Vuori, Ilkka, Hasan, Joel, Partinen, Markku
Published in Social science & medicine (1982) (1988)

by Pertti Hémanus, Helka Urponen
Published in Media & viestintä (01.03.1991)

by Urponen, H, Peltonen, R
Published in International journal of rehabilitation research (01.07.1978)

by Vuori, Hannu, Urponen, Helka, Peltonen, Tuomas
Published in Public health (London) (01.11.1978)

by Martikainen, Kirsti, Partinen, Markku, Hasan, Jóel, Urponen, Hélka, Vuori, IIkka, Laippala, Pékka
Published in European journal of neurology (01.07.1998)