Nenko Atanasov

Authors

• 

  Antonia Koleva – Nitra

• 

  Hristina Tasheva

• 

  Youlian Tabakov

• 

  Nikolay Ninov

• 

  Ivan Paskalev

• 

  Anton Terziev

• 

  Marko Stamenkovic

• 

  Lyuba Tomova