Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve bmcbioinformatics.biomedcentral.com/counter/pdf/10.1186/1471-2105-15-61.pdf, which is not a DOI.
bmcbioinformatics.biomedcentral.com/counter/pdf/10.1186/1471-2105-15-61.pdf may be a Handle (DOIs are a special sort of Handle). If bmcbioinformatics.biomedcentral.com/counter/pdf/10.1186/1471-2105-15-61.pdf is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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