Balakian, Anna, Surrealism: The Road to the Absolute, University of Chicago Press, 1986.

Balakian offers a rewarding insight into the movement that, many critics would argue, has significantly influenced Tranströmer's poetry.

Bly, Robert, Leaping Poetry: An Idea with Poems and Translations, Beacon, 1975.

Bly's theory of "leaping poetry" is a vital contribution to the critical understanding of Tranströmer and other post—World War II European poets popular in the United States.

Steene, Birgitta, "Vision and Reality in the Poetry of Tomas Tranströmer," in Scandinavian Studies, Vol. 37, 1965, pp. 236—44.

Steene offers a general analysis of Tranströmer's techniques and themes. Although it was written long before the publication of "Answers to Letters," her essay provides insights into some of the most important themes of the poem.

Tranströmer, Tomas, and Robert Bly, Air Mail: Brev 1964—1990, compiled by Torbj...