Bilaniuk, O.-M.P.; Sudarshan, E.C.G. (1969). “Particles beyond the Light Barrier”. Physics Today22 (5): 43–51. doi:10.1063/1.3035574. from the Hebrew for "slow"
Johri, V.B.; Srivastava, S.K. (1980). “On the existence of tachyons in a bradyon-dominated universe”. International Journal of Mathematics and Mathematical Sciences8: 389. doi:10.1155/S0161171285000400.