Sentence:  The second three months of life, the critical era in the <WSD>Kleinian</WSD> narrative, are marked by a shift from the paranoid to the "depressive" position produced by the infant's growing ability to integrate contradictory perceptions. 
Meaning of the word marked with <WSD> tags:  Of or pertaining to (Melanie Reizes Klein) (1882–1960), Austrian-born British psychoanalyst who devised novel therapeutic techniques for children.