Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve mailto:Andreas.Kriegl@univie.ac.at, which is not a DOI.
mailto:Andreas.Kriegl@univie.ac.at may be a Handle (DOIs are a special sort of Handle). If mailto:Andreas.Kriegl@univie.ac.at is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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