diff --git a/benchmarks/bench4/bench41.cpp b/benchmarks/bench4/bench41.cpp
new file mode 100644
index 0000000..2ef2d69
--- /dev/null
+++ b/benchmarks/bench4/bench41.cpp
@@ -0,0 +1,46 @@
+//
+//  Copyright (c) 2000-2002
+//  Joerg Walter, Mathias Koch
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//  The authors gratefully acknowledge the support of
+//  GeNeSys mbH & Co. KG in producing this work.
+//
+
+#include <boost/numeric/interval.hpp>
+#include <boost/numeric/interval/io.hpp>
+#include "../bench1/bench11.cpp"
+
+
+#ifdef USE_FLOAT
+template struct bench_1<boost::numeric::interval<float>, 3>;
+template struct bench_1<boost::numeric::interval<float>, 10>;
+template struct bench_1<boost::numeric::interval<float>, 30>;
+template struct bench_1<boost::numeric::interval<float>, 100>;
+#endif
+
+#ifdef USE_DOUBLE
+template struct bench_1<boost::numeric::interval<double>, 3>;
+template struct bench_1<boost::numeric::interval<double>, 10>;
+template struct bench_1<boost::numeric::interval<double>, 30>;
+template struct bench_1<boost::numeric::interval<double>, 100>;
+#endif
+
+#ifdef USE_BOOST_COMPLEX
+#ifdef USE_FLOAT
+template struct bench_1<boost::complex<boost::numeric::interval<float> >, 3>;
+template struct bench_1<boost::complex<boost::numeric::interval<float> >, 10>;
+template struct bench_1<boost::complex<boost::numeric::interval<float> >, 30>;
+template struct bench_1<boost::complex<boost::numeric::interval<float> >, 100>;
+#endif
+
+#ifdef USE_DOUBLE
+template struct bench_1<boost::complex<boost::numeric::interval<double> >, 3>;
+template struct bench_1<boost::complex<boost::numeric::interval<double> >, 10>;
+template struct bench_1<boost::complex<boost::numeric::interval<double> >, 30>;
+template struct bench_1<boost::complex<boost::numeric::interval<double> >, 100>;
+#endif
+#endif