In this case {TAIL ~ algorithms} available from {HEAD ~ the following sources} were used: Hirschberg, D. S 
In this case { TAIL ~ algorithms } available from { HEAD ~ the following sources } were used : Hirschberg , D. S
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH