B.L. Ullman (1882-1965), "Horace and the Philologians," Classical Journal
31.7 (April, 1936) 403-417 (at 413):
A favorite philological pastime has been to search out all possible Greek sources for Horace and other Roman writers. This is
in itself quite commendable, but the comparisons are sometimes
far-fetched and, more important still, the conclusions are not seldom quite erroneous. If some of our philologians are right, a
Roman writer cannot trim his fingernails, so to speak, in his verse,
or comb his hair or kiss his sweetheart without taking the thought
and the expression from a Greek source.