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M. Hall, Jr., The theory of groups, Macmillan, New York, 1959. MR 0103215 (21:1996)

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Graham Higman, Identical relations in finite groups, pp. 93-100, Conv. Internaz. di Teoria dei Gruppi Finiti, Firenze, 1960, Edizioni Cremonese, Rome, 1960. MR 0122858 (23:A190)

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L. G. Kovács and M. F. Newman, Cross varieties of groups, Proc. Roy. Soc. Ser. A 292 (1966), 530-536. MR 0194505 (33:2715)

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R. C. Lyndon, Two notes on nilpotent groups, Proc. Amer. Math. Soc. 3 (1952), 579-583. MR 0049889 (14:242a)

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B. H. Neumann, Identical relations in groups. I, Math. Ann. 114 (1937), 505-525. MR 1513153

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Sheila Oates and M. B. Powell, Identical relations in finite groups, J. Algebra 1 (1964), 11-39. MR 0161904 (28:5108)