Bug report by Carles Pina.
+## 2013-04-17 :: Frank Bennett <firstname.lastname@example.org>
+ At the time of reporting, the target style had no
+ "givenname-disambiguation-rule" set (and MHRA still does not). The
+ specification was subsequently revised to required "by-cite"
+ disambiguation. Under by-cite disambiguation, the subsequent form in
+ the style is "Kim and Kim", without the given names.
B-X Kim and A-Y Kim, 23.