Single-Number Interval I/O. - Michael J. Schulte; Vitaly Zelov; G. William Walster; Dmitri Chiriaev (SCAN, 1998)

The Interval-Enhanced GNU Fortran Compiler. - Michael J. Schulte; Vitaly Zelov; Ahmet Akkas; James Craig Burley (Reliab. Comput., 1999)