He compared the censuses from 1921, 1931 and 1948, and, assuming a possible population growth at 1.1% and emigration in that period, obtained the demographic and what he believed were the actual losses of Yugoslavia during World War II.
In fact, the population growth for Yugoslavia for period 1921-1931 was 1.55%, and for Bosnia and Herzegovina 2.1%, numbers widely different than he used, and his assumptions, later presumably used (or plagiarised) by Vladimir Žerjavić, were called into serious question.
[7] Shortly after Kočović's work was published, Vladeta Vučković, a professor of mathematics at the University of South Bend, claimed in a London based émigré magazine that he had participated in the calculation of the number of victims in Yugoslavia in 1947.
[9] Still, Yugoslav Foreign Minister Edvard Kardelj took this figure as the real loss, conveying it to the Inter-Allied Reparations Agency in 1947.
[10] Kočović's calculations of World War II victims in Yugoslavia are even lower than those of Žerjavić, however the latter gave a more detailed account of numbers and nationalities of the dead.