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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Quasivariety/e4hghXU5">Quasivariety</a></li></ul> <ul><li>Burris, Stanley N.; H.P. Sankappanavar (1981). <i>A Course in Universal Algebra</i>. <a href="/facts/Springer_Science%2BBusiness_Media/nAesf6nT">Springer</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 3-540-90578-2. <a href="http://www.thoralf.uwaterloo.ca/htdocs/ualg.html">Free online edition</a>.</li></ul>