1. I. Ya. Arefeva, B. G. Dragovic, and I. V. Volovich, “Open and closed p-adic strings and quadratic extensions of number fields,” Phys. Lett. B., 212, 283–291 (1988).
2. L. Brekke and P. G. O. Freund, “p-adic numbers in physics,” Phys. Rep., 233, 1–66 (1993).
3. V. S. Vladimirov, “Nonlinear equations for p-adic open, closed, and open-closed strings,” Theor. Math. Phys.,
149, 1604–1616 (2006).
4. N. Moeller and M. Schnabl, “Tachyon condensation in open-closed p-adic string theory,” JHEP, 1401, 011 (2014); arXiv:hep-th/0304213v2.
5. I. Ya. Aref’eva, A. S. Koshelev, and L. V. Joukovskaya, “Time evolution in superstring field theory on non-BPS brane: 1. Rolling tachyon and energy-momentum conservation,” JHEP, 0309, 012 (2003); arXiv:hep-th/0301137v2 (2003).