2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122294We derive twistorial tensionful bosonic string action by considering on the world sheet the canonical twistorial 2-form in two-twistor space. We demonstrate the equivalence of or model to two known momentum formulations of D=4 bosonic string, with covariant worldsheet vectorial string momenta $P_μ^m(τ,σ)$ and the one with tensorial string momenta $P_{[μν]}(τ,σ)$. All considered here string actions, in twistorial and mixed spinor-spacetime formulations, are classically equivalent to the Nambu-Goto action.9 pages, talk given by S. Fedoruk at the XXII Max Born Symposium, Wroclaw, Poland, September 27 - 29, 2006; to be published in the ProceedingsHigh Energy Physics - Theorytext