Vladimirov VS, “The equation of the p-adic closed strings for the scalar tachyon field”, Science in China Series A-Mathematics, 51:4 (2008), 754–764
Dragovich B, “Lagrangians with Riemann zeta function”, Romanian Journal of Physics, 53:9–10 (2008), 1105–1110
Barnaby N., Kamran N., “Dynamics with infinitely many derivatives: variable coefficient equations”, Journal of High Energy Physics, 2008, no. 12, 022
Barnaby N., Kamran N., “Dynamics with infinitely many derivatives: the initial value problem”, Journal of High Energy Physics, 2008, no. 2, 008
Joukovskaya, L, “Dynamics in nonlocal cosmological models derived from string field theory”, Physical Review D, 76:10 (2007), 105007