Love and Mr Lewisham by H. G. Wells: “"But I mean Browning's 'Sludge.' You know the poem." "No--I'm afraid I don't," said Lewisham. "I must lend it to you," she said.”
Possession by A. S. Byatt: “long passage quoted and attributed: "—Robert Browning from 'Mr Sludge, "the Medium"'"”