Соответствующая норма
Yugoslavia, Socialist Federal Republic of
Practice Relating to Rule 20. Advance Warning
The Socialist Federal Republic of Yugoslavia’s Military Manual (1988) states:
When allowed by military necessity, the commander of units bombarding a defended place in which there are civilians or attacking military objectives putting the civilian population at risk should previously inform the population of the impending bombardment or attack so that it can evacuate. The competent commander shall be freed from this obligation if the bombardment undertaken is aimed at supporting units attacking a defended place in order to capture it, if information on the impending bombardment would jeopardize the military operation in question. 
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, § 80.