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Volume 187, No. 2, February, 1999
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Gene Abrams, Jeremy Haefner and Angel del Rio
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The isomorphism problem for incidence rings
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201
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Frauke M. Bleher
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Finite groups of Lie type of small rank
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215
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B. Brenken
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Hecke algebras and semigroup crossed product C*-algebras
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241
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Jean-Noel Corvellec
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Quantitative deformation theorems and critical point theory
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263
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Terry Fuller
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Generalized nuclei of complex surfaces
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281
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Kin Ming Hui
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Singular limit of solutions of the equation ut=Delta(um/m) as m -> 0
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297
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Thomas Michael Keller
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Orbit sizes and character degrees
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317
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Alexandru Nica, Dimitri Shlyakhtenko and Roland Speicher
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Maximality of the microstates free entropy for R-diagonal elements
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333
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Annegret Paul and Eng-Chye Tan
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On the dual pairs (O(p,q),SL(2,R)), (U(p,q),U(1,1)) and (Sp(p,q),O*(4))
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349
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Weiping Zhang
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Analytic and topological invariants associated to nowhere zero vector fields
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379
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