which museum exhibits the two watermills and an open sluice near singraven by jacob van ruisdael ?
select distinct var_uri where brack_open dbr_Two_Watermills_and_an_Open_Sluice_near_Singraven dbo_museum var_uri sep_dot dbr_Two_Watermills_and_an_Open_Sluice_near_Singraven dbo_author dbr_Jacob_van_Ruisdaelbrack_close