Geodesic
On the Godsil--Higman necessary condition for equitable partitions of association schemes
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 699-704

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In his monograph 'Association schemes', C. Godsil derived a necessary condition for equitable partitions of association schemes and noticed that it could be used to show that certain equitable partitions do not exist. In this short note, we show that, in fact, this condition is not stronger than the well-known Lloyd theorem.
Mots-clés : association scheme, equitable partition. 
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     title = {On the {Godsil--Higman} necessary condition for equitable partitions of association schemes},
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A. L. Gavrilyuk; I. Yu. Mogilnykh. On the Godsil--Higman necessary condition for equitable partitions of association schemes. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 699-704. http://geodesic.mathdoc.fr/item/SEMR_2013_10_a40/