Related Rule
Argentina
Practice Relating to Rule 9. Definition of Civilian Objects
Argentina’s Law of War Manual (1989) states:
4.02 – Definitions
(2) Civilian objects are all objects which are not military objectives, that is, those objects which by their nature, location, purpose or use make an effective contribution to military action or whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, offers a definite military advantage.
4.45 – Civilian objects are all objects which are not military objectives. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, §§ 4.02(2) and 4.45.