The interval package is a collection of functions for interval
arithmetic.  It is developed at Octave Forge, a sibling of the GNU
Octave project.  To cite this particular version of the interval package
in publications use:

     @software{octave-interval,
       author  = {Oliver Heimlich},
       title   = {GNU Octave Interval Package},
       url     = {http://octave.sourceforge.net/interval/},
       version = {2.1.0},
       date    = {2016-12-28},
     }

See also ‘citation’ for citing Octave as a whole.

