Buy one get two free: a simpler formulation of natural deduction for computation tree logic CTL
Bolotov, A., Grigoriev, O. and Shangin, V. 2007. Buy one get two free: a simpler formulation of natural deduction for computation tree logic CTL. in: Proceedings of the "Smirnov's Readings", VI International Conference (in Russian) Moscow, Russia Moscow State University.