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by Witten, Edward; Bridson, Martin; Hofer, Helmut; et al.
by Bost, Jean-benoit; Hofer, Helmut; Labourie, François; et al.
by Bost, Jean-benoît; Hofer, Helmut; Labourie, François; et al.
by Abbas, Casim; Hofer, Helmut
by Hofer, Helmut; Zehnder, Eduard
by Hofer, Helmut; Taubes, Clifford H.; Weinstein, Alan; et al.
by Helmut Hofer; Krzysztof Wysocki; Eduard Zehnder
by Casim Abbas; Helmut Hofer