It is mandatory for at least one author of an accepted paper to register and pay the conference fee in order for the paper to include the Conference Program. The conference fee is 250 euro for an author (paper).
If coauthor also like to register himself then each coauthor has to pay the 125 euro in order to get all things as covered in the fee. PhD students may receive 50% support.
There is a possibility to decrease the conference fee up to 50%. Please send a mail to Ivan Ivanovi_ivanov@feb.uni-sofia.bg