MathSciNet bibliographic data MR641583 34A60 (49A50) Cellina, Arrigo On the differential inclusion $x\sp{\prime} \in [-1,\,+1]$$x\sp{\prime} \in [-1,\,+1]$. Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8) 69 (1980), no. 1-2, 1–6 (1981). Links to the journal or article are not yet available

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