RADAVIČIUS, Marijus. Effect of nonresponse in Lithuanian travellers’ survey. Lietuvos matematikos rinkinys, [S. l.], v. 43, n. spec., p. 548–553, 2003. DOI: 10.15388/LMR.2003.32527. Disponível em: https://www.journals.vu.lt/LMR/article/view/32527.. Acesso em: 20 may. 2024.