Belogradchik (Bulgarian: Белоградчик, lit. 'Small White Town'; pronounced [bɛɫoɡrɐtˈt͡ʃik]) is a town in Vidin Province, northwestern Bulgaria, and is...

the Principality of Bulgaria and graduated from secondary school in Belogradtchik. Vlachov also studied chemistry in Germany and Switzerland, where he...