"Similarly, Rabbi Akiva compiled the Mechilta. This is the Mechilta of Rabbi Shimon bar Yochai, which Ramban cited in his Torah commentary in various places, and the Mechilta of Rabbi Yishmael is ours, which he received from Rabbi Nechunia ben HaKana. See in the Yichusim, which refutes those who claim that Rabbi Yishmael received it from Rabbi Akiva. Also, see Gaon Rabbi David Luria in his pamphlet HaEchad Eliezer."