Abstract: The exponential growth of available scientific articles provides researchers with many new challenges and opportunities. Researchers usually analyses divers’ scientific papers to find those pertinent to their research. Citation sentiment analysis is an important task as it can help researchers in identifying shortcomings and detecting problems in a particular approach, determining the quality of a paper for classifying citations that it is positive, negative or neutral in the weighting scheme and recognizing problems that have not been addressed as well as possible gaps in current research approaches.