 Similarly the Price model for scientific citations corresponds to the case "k"0 = 0, "a"  = 1 and the widely studied Barabási-Albert model corresponds to "k"0 = "m", "a" = 0.Preferential attachment is sometimes referred to as the Matthew effect, but the two are not precisely equivalent.The Matthew effect, first discussed by Robert K. Merton, is named for a passage in the biblical Gospel of Matthew