P .. ▁ 1 9 9 7 , ▁Irish ▁Cole optera : ▁a ▁re vised ▁and ▁annot ated ▁list , ▁Irish ▁Natural ists ' ▁Journal ▁Special ▁Ent om ological ▁Supp lement , ▁ 1 - 8 1 ▁ ▁du ▁Ch aten et , ▁G , ▁ 2 0 0 0 , ▁Col é opt ères ▁Ph yt oph ages ▁D ’ Europe , ▁N AP ▁Ed itions , ▁ ▁Johnson , ▁F . W ▁& ▁Hal bert , ▁J . N , ▁ 1 9 0 2 , ▁A ▁list ▁of ▁the ▁Be et les ▁of ▁Ireland , ▁Pro ceed ings ▁of ▁the ▁Royal ▁Irish ▁Academy , ▁ 6 B : ▁ 5 3 5 - 8 2 7 ▁ ▁Joy , ▁N . H ., ▁ 1 9 3 2 , ▁A ▁practical ▁hand book ▁of ▁British ▁be et les , ▁H . F . ▁& ▁G . ▁W ither by , ▁ ▁References ▁ ▁Category : Ch rys om el inae ▁Category : Be et les ▁described ▁in ▁ 1 7 7 5 <0x0A> </s> ▁In ▁quantum ▁information ▁theory ▁and ▁quantum ▁opt ics , ▁the ▁G is in – H ugh ston – J oz sa – W oot ters ▁( G H J W ) ▁theorem ▁is ▁a ▁result ▁about ▁the ▁real ization ▁of ▁a ▁mixed ▁state ▁of ▁a ▁quantum ▁system ▁as ▁an ▁ensemble ▁of ▁pure ▁quantum ▁states ▁and ▁the ▁relation ▁between ▁the ▁corresponding ▁pur ifications ▁of ▁the ▁density ▁operators . ▁ ▁The ▁theorem ▁is ▁named ▁after ▁phys ic ists