Geodesic
Idempotents in The Groupoid of all SP Classes of Lattices
Canadian mathematical bulletin, Tome 21 (1978) no. 4, pp. 499-501

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In [5], Mal'cev generalized the group theoretical results of H. Neumann (see [6] Chapter 2) to produce the notion of the product, of two subclasses of a given variety of algebras, Following the group theorectic example, members of were called extensions of algebras in by algebras in 
Day, Alan. Idempotents in The Groupoid of all SP Classes of Lattices. Canadian mathematical bulletin, Tome 21 (1978) no. 4, pp. 499-501. doi: 10.4153/CMB-1978-085-2
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     author = {Day, Alan},
     title = {Idempotents in {The} {Groupoid} of all {SP} {Classes} of {Lattices}},
     journal = {Canadian mathematical bulletin},
     pages = {499--501},
     year = {1978},
     volume = {21},
     number = {4},
     doi = {10.4153/CMB-1978-085-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-085-2/}
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