From the Spanish magazine "Nueva Dimension" no. 5, 1968, as found on Joan Navarro's blog. Thanks to Joan for allowing me to re-post it here, and to Alvaro Pons for the heads-up!
More on the artist.
As can be seen on the first page, these comics were influenced by the abstract animation of Norman McLaren. The relationship between abstract comics and abstract film needs to be further investigated.
By the way, I can sort of read the opening text, but if any Spanish speaker here would be willing to provide a proper translation in the comments, I would be tremendously grateful.