“…Some studies have also analyzed the impact of internal factors that belong to firms' characteristics and competencies such as firms' sources, company tradition (Lobo, Fernandes, Ferreira, Peris-Ortiz, 2020), lack of knowledge of the international market (Hutchinson, Fleck, Lloyd-Reason, 2009) on internationalization and the export activities of SMEs (Virglerova et al, 2020b). The positive relationship between firm size and export activities (Silva, Franco, Magrinho, 2016;Lejárraga, Oberhofer, 2015;Radojević, Marjanović, Radovanov, 2014), and firm age and exports (Daszkiewicz, 2014) have been analyzed by some studies. The differences in the percetions of export barriers by SMEs in various sectors (Lejárraga, Oberhofer, 2015;Al-Hyari, Al-Weshah, Alnsour, 2012;Silva et al, 2016) and legal forms have also been highlighted by some studies (Lejárraga, Oberhofer, 2015;Subrahmanya, 2014).…”