I was searching Google and I got this link:
[BOOK] Salvador Dali, Or the Art of Spitting on Your Mother's Portrait - Google Books Resultby Carlos Rojas - 1993 - 199 pages
He had conceived the canvas in 1968, when he saw a box of pencils of the British brand Venus Esterbrook. He immediately visualized the head of a ...
books.google.com/books?isbn=0271008423...
In page 178 there is the small text I quoted above. Does anyone have this book?
Which Dali's work was inspired by Venus-Esterbrook Pencils?