References

Hekster, N.S., 1989. Varieties of groups and isologism. J. Aust. Math. Sco. Ser. A, 46: 22-60.
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Neumann, H., 1967. Varieties of Groups. Springer, Berlin, Germany, ISBN:9780387037790, Pages: 192.

Taheri, S.M. and F. Shahini, 2011. Varietal nilpotent groups. World Appl. Sci. J., 12: 2314-2316.
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Taheri, S.M. and M. Parvizian, 2010. Properties of the varietal nilpotent groups. Intl. J. Algebra, 4: 1393-1397.
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Taheri, S.M., 2009. Remarks on the varietal nilpotent and soluble groups. JPJ. Algebra Num. Theor. Appl., 13: 153-159.