Howdy Ernie; Although both UNGAR 181 and UNGAR 194 mention the word "return" in connection with refugees, they are General Assembly Resolutions and are, therefore, nonbinding and unenforceable. UNGARs are not part of the body of international law. The pertinent international law is UNSCR 242 (and reaffirmed by UNSCR 338) which calls "For achieving a just settlement of the refugee problem;". Notice that there is no so-called "right of return", the Palestinian refugees are not distiquished from Jewish ones, and no state is singled out as being solely responsible for the "just settlement".
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: Between prisoners and captives