↑ "The authorites did not recognise the legality of residence in the country of anyone not registered during the November 1948 census and issued with an identity card or military pass. Anyone who had left the country for any reason before the census, and was not registered and in possession of a card or pass was regarded as an "absentee. " If he subsequently infiltrated back into the country (including to his home village), he was regarded "as illegal" and could be summarily deported. The IDF repeatedly raided villages, sorted out legal from illegal residents and, usually, expelled the "returnees. "" Morris, Benny (1987) The birth of the Palestinian refugee problem, 1947-1949. Cambridge University Press. ISBN 0-521-33028-9. p.240
