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Not a DOI

The resolution service at https://doi.org resolves DOIs. You have attempted to resolve mailto:katai@compalg.inf.elte.hu, which is not a DOI.

mailto:katai@compalg.inf.elte.hu may be a Handle (DOIs are a special sort of Handle). If mailto:katai@compalg.inf.elte.hu is a valid Handle you should be able to resolve it at https://hdl.handle.net.

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