Considerable confusion exists in the literature of this area because: (1) many sources do not distinguish between "A"G and "A"0, but just use the symbol "A" (and sometimes the name "Richardson constant") indiscriminately; (2) equations with and without the correction factor here denoted by "λ"R are both given the same name; and (3) a variety of names exist for these equations, including "Richardson equation", "Dushman's equation", "Richardson–Dushman equation" and "Richardson–Laue–Dushman equation". In the literature, the elementary equation is sometimes given in circumstances where the generalized equation would be more appropriate, and this in itself can cause confusion. To avoid misunderstandings, the meaning of any "A-like" symbol should always be explicitly defined in terms of the more fundamental quantities involved.