ition ▁not ▁held ▁between ▁ 1 9 7 0 ▁and ▁ 1 9 8 6 . ▁ ▁Juni ors ▁ ▁Boys ' ▁singles ▁ ▁Ray ▁Kelly ▁ ▁Girls ' ▁singles ▁ ▁Am anda ▁Tob in ▁ ▁References ▁▁▁▁▁▁▁▁▁▁▁▁ 1 9 7 7 - 1 2 ▁Category : 1 9 7 7 ▁in ▁Australian ▁tennis ▁* ▁ 2 ▁Australian ▁Open ▁Category : 1 9 7 0 s ▁in ▁Melbourne <0x0A> </s> ▁La f fer ent z ▁is ▁a ▁surname . ▁Notable ▁people ▁with ▁the ▁surname ▁include : ▁ ▁B odo ▁La f fer ent z ▁( 1 8 9 7 – 1 9 7 4 ), ▁German ▁SS ▁officer , ▁Ver ena ' s ▁sp ouse ▁Ver ena ▁Wagner ▁La f fer ent z ▁( 1 9 2 0 – 2 0 1 9 ), ▁grand d augh ter ▁of ▁Richard ▁Wagner <0x0A> </s> ▁The ▁Pen rose ▁method ▁( or ▁square - root ▁method ) ▁is ▁a ▁method ▁de vised ▁in ▁ 1 9 4 6 ▁by ▁Professor ▁Lion el ▁Pen rose ▁for ▁alloc ating ▁the ▁voting ▁weights ▁of ▁deleg ations ▁( poss ibly ▁a ▁single ▁representative ) ▁in ▁decision - making ▁bodies ▁proportional ▁to ▁the ▁square ▁root ▁of ▁the ▁population ▁represented ▁by ▁this ▁deleg ation . ▁This ▁is ▁just ified ▁by ▁the ▁fact , ▁that ▁due ▁to ▁the ▁square ▁root ▁law ▁of ▁Pen rose , ▁the ▁a ▁pri ori ▁voting ▁power ▁( as ▁defined ▁by ▁the ▁Pen rose – B anz h af ▁index ) ▁of ▁a ▁member ▁of ▁a ▁voting ▁body ▁is