@book{Plotinus, author = {Plotinus,}, title = {Plotinus in six Volumes. Volume 1, Cambridge (Harvard University Press) 1966.}, language = {en} } @book{Plotinus, author = {Plotinus,}, title = {Plotinus in six Volumes. Volume 2, Cambridge (Harvard University Press) 1966.}, language = {en} } @book{Plotinus, author = {Plotinus,}, title = {Plotinus in six Volumes. Volume 3, Cambridge (Harvard University Press) 1966.}, language = {en} }