Klein's major paper, 'Notes on Some Schizoid Mechanisms', introduces the concept of the paranoid-schizoid position, in which the infant ego splits, projects and introjects its objects - most particularly the mother - during the first few months of life.
Envy and Gratitude, her last major work, introduces her theory of primary envy.
Vintage Publishing Envy and gratitude and other works 1946-1963, paperback/melanie klein
