URN Resolving (URL input, example):
https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2017-12-13.019 (URN Linking to URL)
https://nbn-resolving.org/html/urn:nbn:de:gbv:18302-aero2017-12-13.019 (URN only Showing URL - add "html/" into the link above)
URN Resolving (URL input, example):
https://portal.dnb.de/opac.htm?&query=urn:nbn:de:gbv:18302-aero2017-12-13.019 (URN Linking to DNB dataset)
DOI Resolving (DOI Input in URL; Example):
https://doi.org/10.15488/2553 (DOI Linking to URL)
Alternatively: DOI Resolving via NBN (DOI Input in URL;Example)
https://nbn-resolving.org/doi:10.15488/2553 (DOI Linking to URL)
https://nbn-resolving.org/html/doi:10.15488/2553 (DOI only Showing URL - add "html/" into the link above)
DOI Search @ DataCite (input into form)
https://search.datacite.org (input of title or DOI)
DOI Search @ DataCite (input attached to link)
https://search.datacite.org/works/10.15488/2553 (input of DOI)
ARK Resolving (ARK input attached to link; Example):
https://n2t.net/ark:/13960/t21c9gb80
ARK Shows Metadata (ARK Input in URL with ? or ??; Example):
https://n2t.net/ark:/13960/t21c9gb80??
N2T.net as Universal Resolver: https//n2t.net/scheme:[/]naan/string
"N2T.net is a kind of URL shortener for persistent identifiers."
For details see: https://n2t.net/e/compact_ids.html and https://n2t.net/e/n2t_apidoc.html
Examples of scheme: ARK, DOI, URN, HDL:
https://n2t.net/ark:/13960/t21c9gb80
also this works without "/":
https://n2t.net/ark:13960/t21c9gb80
https://n2t.net/doi:10.15488/4316 instead of https://doi.org/10.15488/4316
https://n2t.net/urn:nbn:de:gbv:18302-aero2018-08-31.016 instead of https://nbn-resolving.org/urn:nbn:de:gbv:18302-aero2018-08-31.016
https://n2t.net/hdl:/2299/5809 instead of https://hdl.handle.net/2299/5809
DOI Search for Open Access Version of Paper
Install in Browser: http://unpaywall.org
Same but as Resolver: http://api.oadoi.org/10.1038/nature21360
Alternative Resolver: http://doai.io/10.1038/nature21360