MathSciNet bibliographic data MR985724 (90c:58028) 58C27 (58A35) Mormul, Piotr Singularities of triples of vector fields on ${\bf R}\sp 4$${\bf R}\sp 4$: the focusing stratum. Studia Math. 91 (1988), no. 3, 241–273. Links to the journal or article are not yet available

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