What is the earliest mention of Nostr in a printed book?

Broken Money mentioned Nostr and was published in August 2023. I assume some other printed books must have at least mentioned it within the year prior to that? nostr:note1u7hfudn3j0rft2uv2ae7a9dlw33pcrjtu7cp7g7u9edpcp87e3jsy5z4uk