UDAL, A.; KUKK, V.; VELMRE, E. Critical Analysis of Uncertainty Relations Based on Signal Duration and Spectrum Width. Elektronika ir Elektrotechnika, [S. l.], v. 94, n. 6, p. 31-34, 2009. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/10098. Acesso em: 27 sep. 2022.