In his geophysical research, Professor Keller has used interval techniques. His paper "Eliminating Duplicates Under Interval and Fuzzy Uncertainty: An Asymptotically Optimal Algorithm and Its Geospatial Applications" appeared in Kluwer-published international journal Reliable Computing (2004, Vol. 10, No. 5, pp. 401-422).
He co-authored several interval-related papers in the conference proceedings, including the proceedings of the 2004 NSF Conference on Reliable Engineering Computing in Savannah, Georgia.
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