"And I have known the eyes already, known them all—"The eyes that fix you in a formulated phrase"(fragmentation, anxiety, isolation)
(a) identify what work it comes from, who the author of that work is, and how the term comes up in that work (e.g. who a character is, the speaker of a quote, how a term/setting/object comes up in the plot, the context of a line of poetry, etc.)