@book {Lehmann1993, title = {Theoretical bases of Indo-European linguistics}, year = {1993}, note = {

Includes bibliographical references (p. 298-315) and index

}, pages = {XI, 324}, publisher = {Routledge}, organization = {Routledge}, edition = {1}, address = {London ; New York}, keywords = {Indo-European languages {\textendash} Research {\textendash} History, Proto-Indo-European language}, author = {Lehmann, W. P.} }