@ARTICLE{
author={Alves Luis,Gajic Dusan B,Rangel Henriques Pedro,Ivancevic Vladimir,Ivkovic Vladimir,Lalic Maksim S,Lukovic Ivan S,Varanda Pereira Maria Joao,Popov Srdjan B,Correia Tavares Paula},
year={2020},
title={C Tutor usage in relation to student achievement and progress: A study of introductory programming courses in Portugal and Serbia},
journal={COMPUTER APPLICATIONS IN ENGINEERING EDUCATION},
volume={28},
number={5},
pages={1058-1071},
document_type={Article},
} 

@ARTICLE{
author={Lukovic Ivan S,Varanda Pereira Maria Joao,Oliveira Nuno G,da Cruz Daniela,Henriques Pedro Rangel},
year={2011},
title={A DSL for PIM Specifications: Design and Attribute Grammar based Implementation},
journal={COMPUTER SCIENCE AND INFORMATION SYSTEMS},
volume={8},
number={2},
pages={379-403},
document_type={Article},
}