1. 
   Pernik
   town, west-central Bulgaria. The town is located on the banks of the Struma River, 19 miles (31 km) southwest of Sofia. Originally a Bulgarian ...
   Found op http://www.britannica.com/eb/a-z/p/46
   
   
2. 
   Pernik
   Pernik (Перник) is a city in western Bulgaria (around 30 km south-west of Sofia) with a population of 81,052 {As of|2011|lc=on}. It is the main city of Pernik Province and lies on both banks of the Struma River in the Pernik Valley between the Viskyar, Vitosha and Golo Bardo mountains. Origin...
   Found op http://en.wikipedia.org/wiki/Pernik
   
   
3. 
   Pernik
   Pernik (per'nik) , city (1993 pop. 91,075), W Bulgaria, on the Struma River. The industrial center of a coal-mining region, it has iron and steel smelters, glassworks, and power plants. Pernik is linked by rail with Sofia and Greece. It was known as Dimitrovo from 1949 to 1962.
   Found op http://www.infoplease.com/ce6/world/A0838472.html
   
   

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