Starting from 1-1-2019, all submitted articles will have to pay a fee of 500 euro (for the articles submitted before 1st January 2019 the fee will be 250 euro). The fee should be paid after the acceptation of the article and before the publication. Instructions are given in the Journal’s Guidelines. The fee is due for all the articles submitted. The new policy doesn't provide any waves or discounts. The discount/waiver requests will not be answered.