Boccioni, Russolo and I all met in the Porta Vittoria café (in Milan, Italy, ed.), close to where we all lived, and we enthusiastically outlined a draft of our appeal [the Manifesto of Futurist Painters, late February, 1910]. The final version was somewhat laborious; we worked on it all day, all three of us and finished it that evening with Marinetti and the help of Decio Cinti, the group's secretary.

p. 23 the painters Bonzagni and Romani signed this famous Manifesto version too, but withdraw soon; they were replaced by Giacomo Balla and Gino Severini - La mia Vita (1945), Carlo Carrà; as quoted in Futurism, ed. Didier Ottinger (2008)