To prepare bibliography for Physical Review Applied, I modified apsrev4-1.bst of revtex.

Modified:

• In string.enquote, I commented out bbl.enquote “{” * swap$ * “}” *
• I set #1 for control.title （just before ‘control.title :=, because of RPN）
• I saved as apsrev4-1_custom.bst, and put \bibliographystyle{apsrev4-1_custom} in the main tex file.