which cover artist of the the book about moomin also the source of inspiration of comet in moominland ?
SELECT DISTINCT var_uri where brack_open dbr_The_Book_about_Moomin,_Mymble_and_Little_My dbo_coverArtist var_uri sep_dot dbr_Comet_in_Moominland_ attr_open film attr_close dbo_basedOn var_uri brack_close