Michael Morris, Ulvis Yurtsever e Kip Thorne, "Wormholes, Time Machines, and the Weak Energy Condition" (abstract), in Physical Review Letters, vol. 61, n. 13, Pasadena, 26 settembre 1988, pp. 1446-1449, DOI:10.1103/PhysRevLett.61.1446.
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Michael Morris, Ulvis Yurtsever e Kip Thorne, "Wormholes, Time Machines, and the Weak Energy Condition" (abstract), in Physical Review Letters, vol. 61, n. 13, Pasadena, 26 settembre 1988, pp. 1446-1449, DOI:10.1103/PhysRevLett.61.1446.