▁was ▁one ▁of ▁the ▁found ers ▁of ▁the ▁Swedish ▁Liter ature ▁Society ▁in ▁U pp s ala . ▁He ▁developed ▁a ▁reputation ▁as ▁a ▁for em ost ▁literary ▁historical ▁research ers . ▁He ▁worked ▁on ▁the ▁development ▁of ▁historic ▁literature ▁studies ▁ ▁with ▁university ▁professor ▁and ▁li br arian ▁of ▁the ▁Nobel ▁Library ▁of ▁the ▁Swedish ▁Academy , ▁Karl ▁Johan ▁War burg ▁( 1 8 5 2 - 1 9 1 8 ). ▁ ▁They ▁joint ed ▁edited ▁ ▁Ill ust rer ad ▁svensk ▁l itter atur histor ia ▁which ▁covers ▁Swedish ▁literature ▁for ▁the ▁period ▁up ▁to ▁ 1 8 7 0 . ▁He ▁also ▁wrote ▁a ▁series ▁of ▁bi ograph ies ▁of ▁historic ▁figures ▁including ▁ ▁Engel bre kt ▁Engel bre kt sson , ▁O laus ▁Pet ri , ▁King ▁Gustav ▁III ▁as ▁well ▁as ▁William ▁Shakespeare . ▁ ▁Selected ▁works ▁William ▁Sch ak sp ere , ▁hans ▁lif ▁och ▁ver ksam het , ▁( 1 8 8 3 - 8 4 ) ▁Sk rif ter ▁i ▁svensk ▁l itter atur histor ia , ▁( 1 8 8 7 ) ▁V å ra ▁ä ld sta ▁histor iska ▁folk visor , ▁( 1 8 9 1 ) ▁Lars ▁W ival lius , ▁hans ▁lif ▁och ▁d ik ter , ▁ 2 ▁vol ., ▁( 1 8 9 3 - 9 5 ) ▁ ▁All m än ▁l itter atur histor ia , ▁( se ver al ▁versions ) ▁ ▁B id rag ▁till ▁svensk ▁b ok histor ia , ▁( 1