Edward Hadley: The Elegies of Ted Hughes. Palgrave Macmillan, 2010.
From the cover blurb:
The Elegies of Ted Hughes opens a new line of enquiry into the verse of one of Britain's most highly regarded poets. Marking the first full length study of Hughes' relationship with the poetry of mourning, the elegy, The Elegies of Ted Hughes chronologically examines all the poet's major works and those uncollected poems which harbour an innate elegiac quality.
From verse inspired by the national grief caused by the First World War, to lamenting the decline and fall of nature and local industry, to intimate and arresting elegies written for Assia Wevill, Sylvia Plath and his family, The Elegies of Ted Hughes is a comprehensive and enlightening addition to the ongoing study of his poetry.
More details here.