How can I get list of views that are using given column in table?

hi
I have situation, where I need to change datatype of column.
But when I do:
alter table xx alter column yy type zz;
i get error:
ERROR:  cannot alter type of a column used by a view or rule
DETAIL:  rule _RETURN on view some_view depends on column "yy"

how can I get a list of all such views (in a sqlish way, so I could make a
query to return all needed objects that need to be dropped/recreated).

Best regards,

depesz

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