“Chapters 1 and 2 are the collaboration of Pam and Brian, with a heavy admixture of Ben. Chapters 3 and 4 belong largely to Brian and Tony. Chapter 5 is the fruit of Pam’s long efforts in the Vatican Library and the Roman archives. Chapters 6 and 7 are largely the work of Tony, with interventions from Brian. Chapters 8 and 9 are a three-way collaboration, with equal parts Ben, Brian, and Tony. Chapters 10 and 11 are Ben’s. Chapter 12, the epilogue, belongs to all of us. But this is truly a collaborative work.”
—from the introduction to Obelisk: A History, by Brian A. Curran, Anthony Grafton, Pamela O. Long, and Benjamin Weiss (2009)
"The vision of H.P. Lovecraft as a matchmaker is an unlikely one, but knowing that a young author named Henry Kuttner had been greatly impressed by C.L. Moore’s fiction, he arranged a correspondence between the two, which eventually culminated in their marriage.
"[…][T]he marriage was professional as well as personal; few stories by either of them after the event were by one of them alone. Dual efforts would appear under either name, not to mention any one of nineteen (!) pseudonyms."
—from A Reader's Guide to Science Fiction (1980)