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Shigenori Seki, Tomohiko Takahashi. Reduction of open string amplitudes by mostly BRST exact operators. Physics Letters B. 2021. 822. 136664-136664
Isao Kishimoto, Tomohiko Takahashi. Numerical twist-even SU(1,1)-singlet solutions in open string field theory around the identity-based solution. Journal of High Energy Physics. 2021. 2021. 2