PENKAUSKAS, A. The perception performance of visual signal stimuli when their density is changing. Psichologija, [S. l.], v. 7, p. 35–47, 1965. DOI: 10.15388/Psichol.1965.7.8908. Disponível em: https://test.zurnalai.vu.lt/psichologija/article/view/8908. Acesso em: 25 oct. 2025.