N . J .) ▁ 2 0 0 0 . ▁Re ine ▁Rechts le hre , ▁Vienna ▁ 1 9 6 0 , ▁" 2 nd ▁ed n " ▁although ▁a ▁different ▁work ; ▁am ended , ▁T üb ingen ▁ 2 0 1 7 . ▁P ure ▁Theory ▁of ▁Law ▁( 1 9 6 0 ; ▁Knight ▁trans .), ▁Ber keley ▁ 1 9 6 7 , ▁Union ▁( N . J .) ▁ 2 0 0 2 . ▁Thé orie ▁pure ▁du ▁droit ▁( 1 9 6 0 ; ▁Eisen mann ▁trans .), ▁Paris ▁ 1 9 6 2 . ▁General ▁Theory ▁of ▁Law ▁and ▁State ▁( G erman ▁original ▁not ▁published ; ▁Wed berg ▁trans .), ▁ 1 9 4 5 , ▁New ▁York ▁ 1 9 6 1 , ▁Clark ▁( N . J .) ▁ 2 0 0 7 . ▁What ▁is ▁Justice ?, ▁Ber keley ▁ 1 9 5 7 . ▁' The ▁Function ▁of ▁a ▁Constitution ' ▁( 1 9 6 4 ; ▁Stewart ▁trans .) ▁in ▁Richard ▁Tur ▁and ▁William ▁Tw ining ▁( eds ), ▁Ess ays ▁on ▁K elsen , ▁Oxford ▁ 1 9 8 6 ; ▁also ▁in ▁ 5 th ▁and ▁later ▁ed itions ▁of ▁Lloyd ' s ▁Introduction ▁to ▁Jur is pr ud ence , ▁London ▁( current ly ▁ 8 th ▁ed ▁ 2 0 0 8 ). ▁Ess ays ▁in ▁Leg al ▁and ▁Mor al ▁Philosoph y ▁( We in berger ▁sel ., ▁He ath ▁trans .), ▁D ord