by Ciaramella, A., Bongardo, C., Aller, H. D., Aller, M. F., De Zotti, G., Lähteenmaki, A., Longo, G., Milano, L., Tagliaferri, R., Teräsranta, H., Tornikoski, M., Urpo, S.
Published in Astronomy and astrophysics (Berlin) (01.05.2004)

by Kislyakova, K. G., Zaitsev, V. V., Urpo, S., Riehokainen, A.
Published in Astronomy reports (01.03.2011)

by Khodachenko, M. L., Zaitsev, V. V., Kislyakov, A. G., Rucker, H. O., Urpo, S.
Published in Astronomy and astrophysics (Berlin) (01.04.2005)

by Kislyakov, A G, Zaitsev, V V, Stepanov, A V, Urpo, S
Published in Solar physics (01.01.2006)

by Teräsranta, H., Urpo, S., Wiren, S., Valtonen, M.
Published in Astronomy and astrophysics (Berlin) (01.03.2001)

by Khodachenko, M L, Rucker, HO, Kislyakov, A G, Zaitsev, V V, Urpo, S
Published in Space science reviews (01.02.2006)

by Teräsranta, H., Tornikoski, M., Mujunen, A., Karlamaa, K., Valtonen, T., Henelius, N., Urpo, S., Lainela, M., Pursimo, T., Nilsson, K., Wiren, S., Lähteenmäki, A., Korpi, M., Rekola, R., Heinämäki, P., Hanski, M., Nurmi, P., Kokkonen, K., Keinänen, P., Joutsamo, O., Oksanen, J., Pietil, H., Valtaoja, E., Valtonen, M., Könönen, P.
Published in Astronomy & astrophysics. Supplement series (01.11.1998)

by Grebinskij, A., Bogod, V., Gelfreikh, G., Urpo, S., Pohjolainen, S., Shibasaki, K.
Published in Astronomy & astrophysics. Supplement series (01.05.2000)

by Riehokainen, A., Tlatov, A.G., Urpo, S., Valtaoja, E.
Published in Proceedings of the International Astronomical Union (01.06.2004)

by Brajsa, R, Ruzdjak, V, Vrsnak, B, Woehl, H, Pohjolainen, S, Urpo, S
Published in Solar physics (01.02.1999)

by Zaitsev, V V, Kislyakov, A G, Urpo, S, Stepanov, A V, Shkelev, E I
Published in Astronomy reports (01.10.2003)

by Pohjolainen, S, Valtaoja, E, Urpo, S, Aurass, H
Published in Solar physics (01.06.1997)

by Pohjolainen, S., Valtaoja, E., Urpo, S.
Published in Advances in space research (01.01.1997)

by Pohjolainen, S, Urpo, S, Herrmann, R
Published in Advances in space research (1996)

by Urpo, S., Bakhareva, N. M., Zaitsev, V. V., Stepanov, A. V.
Published in Solar physics (01.10.1994)

by Urpo, S., Pohjolainen, S., Kr ger, A.
Published in Space science reviews (01.10.1994)

by Schwarz, U., Kurths, J., Kliem, B., Krüger, A., Urpo, S.
Published in Astronomy & astrophysics. Supplement series (01.01.1998)

by STEPANOV, A. V, URPO, S, ZAITSEV, V. V
Published in Solar physics (01.07.1992)

by BRAJSA, R, VRSNAK, B, RUZDJAK, V, SCHROLL, A, POHJOLAINEN, S, URPO, S, TERAÊSRANTA, H
Published in Solar physics (01.06.1991)

by VRSNAK, B, POHJOLAINEN, S, URPO, S, TERÄSRANTA, H, BRAJSA, R, RUZDJAK, V, MOURADIAN, Z, JURAC, S
Published in Solar physics (1992)