MathSciNet bibliographic data MR1649433 (99i:49005) 49J10 (49K10) Pedregal, Pablo; Šverák, Vladimír A note on quasiconvexity and rank-one convexity for $2\times 2$$2\times 2$ matrices. J. Convex Anal. 5 (1998), no. 1, 107–117. Journal

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