Geodesic
A Note on the Implicational Class Generated by a Class of Structures
Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 603-605

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We use the notations of [2], particularly for operators on classes of structures; in addition, P* r(K) (respectively, Pr(K)) denotes the class of all reduced products of families of structures in K (those with respect to a proper dual ideal, respectively). 
Grätzer, G.; Lakser, H. A Note on the Implicational Class Generated by a Class of Structures. Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 603-605. doi: 10.4153/CMB-1973-100-4
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