Règle correspondante
Yugoslavia, Federal Republic of
Practice Relating to Rule 42. Works and Installations Containing Dangerous Forces
The Report on the Practice of the Federal Republic of Yugoslavia states:
It does not appear that the question of violations of norms relevant to protection of works and installations containing dangerous forces had been raised during armed conflicts in Slovenia and Croatia involving YPA [Yugoslav People’s Army]. There was no information on such incidents, nor was the issue a matter of dispute between the parties concerned.
The report concludes that the existence of an opinio juris in favour of protection from attacks of works or installations containing dangerous forces is “obvious”. 
Report on the Practice of the Federal Republic of Yugoslavia, 1997, Chapter 1.9.