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Sauvage, Jean-Pierre (1993) Photoinduced electron transfer in multiporphyrin clusters and rotaxanes. Three sets of experiments on suspensions of “hardsphere” colloids are descri bed. Suspensions of equal-sized particles exhibit the hardsphere freezing and glass transitions, Mixtures of spheres of two different sizes can form the ordered binary crystals A, LXXI. pp. 225-227.