an Entity references as follows:
Petro Tronko (12 July 1915 - 12 September 2011) was a Ukrainian academician of the National Academy of Sciences of Ukraine and veteran of World War II. He was a head of editorial collegium for the 26 volume encyclopedia on "The History of Cities and Villages of the Ukrainian SSR. In 1968 Tronko defended his doctorate dissertation "Ukrainian people in fight against Hitlerites occupiers during the Great Patriotic War (1941-45)". In 1969 Tronko initiated the creation of Pyrohiv scansen that was opened in 1976.