Josep GUDIOL i CUNILL, Els Primitius: primera part: els pintors: la pintura mural. Barcelona: S. Babra, 1927.

A work that constitutes the first systematization and general and complete study of Catalan Romanesque painting, both mural and on wood and miniature.

In the image we see the main apse of the church in Mur, Pallars Jussà.