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Yugoslavia, Socialist Federal Republic of
Practice Relating to Rule 54. Attacks against Objects Indispensable to the Survival of the Civilian Population
Section C. Attacks in case of military necessity
The Socialist Federal Republic of Yugoslavia’s Military Manual (1988) provides an exception to the prohibition of attacks against objects indispensable to the survival of the civilian population in times of enemy invasion of the national territory, if required by reason of military necessity. 
Yugoslavia, Socialist Federal Republic of, Propisi o Primeri Pravila Medjunarodnog Ratnog Prava u Oruzanim Snagama SFRJ, PrU-2, Savezni Sekretarijat za Narodnu Odbranu (Pravna Uprava), 1988, § 74.