This ID number can be used to provide references and {HEAD ~ links} to {TAIL ~ other relevant documents} as well 
to
This ID number can be used to provide references and { HEAD ~ links } to { TAIL ~ other relevant documents } as well
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH