Zeitschriftenartikel
Borrero, J. M.; Solanki, S. K.; Bellot Rubio, L. R.; Lagg, A.; Mathew, S. K.: On the fine structure of sunspot penumbrae - I. A quantitative comparison of two semiempirical models with implications for the Evershed effect. Astronomy and Astrophysics
422, S. 1093 - 1104 (2004)