Geodesic
On varieties of orgraphs
Discussiones Mathematicae. Graph Theory, Tome 21 (2001) no. 2, pp. 207-221

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In this paper we investigate varieties of orgraphs (that is, oriented graphs) as classes of orgraphs closed under isomorphic images, suborgraph identifications and induced suborgraphs, and we study the lattice of varieties of tournament-free orgraphs.
Keywords: orgraph, variety, lattice 
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Haviar, Alfonz; Monoszová, Gabriela. On varieties of orgraphs. Discussiones Mathematicae. Graph Theory, Tome 21 (2001) no. 2, pp. 207-221. http://geodesic.mathdoc.fr/item/DMGT_2001_21_2_a5/