Error - DOI Naming Authority [nmat] Not Found

The DOI you requested --

nmat/

-- cannot be found in the Handle System.

Possible reasons for the error are:

• the DOI has not been created
• the DOI is cited incorrectly in your source
• the DOI does not resolve due to a system problem

The DOI you requested included a trailing slash character (/) which may be incorrect. Click here to attempt to resolve the DOI without the slash. Please note that a DOI with and without a trailing slash are different identifers and will likely return different results.

If you believe you have requested a DOI that should be found, you may report this error by filling out the form below: