▁assign s ▁a ▁( pos itive ▁or ▁negative ) ▁score ▁to ▁the ▁sentence . ▁After ▁all ▁he ur istics ▁have ▁been ▁applied , ▁the ▁highest - sc oring ▁sentences ▁are ▁included ▁in ▁the ▁summary . ▁The ▁individual ▁he ur istics ▁are ▁weight ed ▁according ▁to ▁their ▁importance . ▁ ▁Early ▁approaches ▁and ▁some ▁sample ▁he ur istics ▁ ▁Sem inal ▁papers ▁which ▁laid ▁the ▁found ations ▁for ▁many ▁techniques ▁used ▁today ▁have ▁been ▁published ▁by ▁Hans ▁Peter ▁Lu hn ▁in ▁ 1 9 5 8 ▁and ▁H . ▁P ▁Edmund son ▁in ▁ 1 9 6 9 . ▁ ▁Lu hn ▁proposed ▁to ▁assign ▁more ▁weight ▁to ▁sentences ▁at ▁the ▁beginning ▁of ▁the ▁document ▁or ▁a ▁paragraph . ▁Edmund son ▁str essed ▁the ▁importance ▁of ▁title - words ▁for ▁summar ization ▁and ▁was ▁the ▁first ▁to ▁employ ▁stop - lists ▁in ▁order ▁to ▁filter ▁un in form ative ▁words ▁of ▁low ▁semantic ▁content ▁( e . g . ▁most ▁gram mat ical ▁words ▁such ▁as ▁" of ", ▁" the ", ▁" a "). ▁He ▁also ▁distinguished ▁between ▁bonus ▁words ▁and ▁st igma ▁words , ▁i . e . ▁words ▁that ▁probably ▁occur ▁together ▁with ▁important ▁( e . g . ▁the ▁word ▁form ▁" sign ific ant ") ▁or ▁un important ▁information . ▁His ▁idea ▁of ▁using ▁key - words , ▁i . e . ▁words ▁which ▁occur ▁significantly ▁frequently ▁in ▁the ▁document , ▁is ▁still ▁one ▁of ▁the ▁core ▁he ur istics ▁of ▁today ' s ▁summar izers . ▁With ▁large