The congruence variety of metabelian groups is not self-dual.
Czédli, G.
Acta Mathematica Universitatis Comenianae. New Series, Tome 63 (1994), p. 155-159 / Harvested from The Electronic Library of Mathematics
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Publié le : 1994-01-01
EUDML-ID : urn:eudml:doc:118729 
@article{00750683,
     title = {The congruence variety of metabelian groups is not self-dual.},
     journal = {Acta Mathematica Universitatis Comenianae. New Series},
     volume = {63},
     year = {1994},
     pages = {155-159},
     zbl = {0826.08003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00750683}
}

Czédli, G. The congruence variety of metabelian groups is not self-dual.. Acta Mathematica Universitatis Comenianae. New Series, Tome 63 (1994) pp. 155-159. http://gdmltest.u-ga.fr/item/00750683/