2 0 0 4 . ▁The ▁X A 4 2 ▁received ▁a ▁type ▁certificate ▁from ▁the ▁European ▁A viation ▁Saf ety ▁Agency ▁in ▁March ▁ 2 0 1 1 . ▁In ▁November ▁ 2 0 1 2 ▁it ▁received ▁its ▁type ▁cert ification ▁through ▁the ▁F AA . ▁ ▁Spec ifications ▁( ac rob atic ) ▁ ▁References ▁ ▁Notes ▁ ▁External ▁links ▁▁ ▁X tre me A ir ▁GmbH ▁- ▁company ▁website ▁ ▁Category : 2 0 0 0 s ▁German ▁sport ▁aircraft ▁Category : A er ob atic ▁aircraft ▁Category : Single - eng ined ▁tra ctor ▁aircraft ▁Category : L ow - wing ▁aircraft ▁Category : A ircraft ▁first ▁flow n ▁in ▁ 2 0 0 8 ▁Category : Con vent ional ▁landing ▁g ear <0x0A> </s> ▁The ▁Japan ▁Medical ▁Association ▁Journal ▁( J MA J ) ▁is ▁a ▁quarter ly ▁general ▁medical ▁journal . ▁The ▁journal ▁was ▁first ▁published ▁in ▁ 1 9 5 8 ▁as ▁the ▁Asian ▁Medical ▁Journal , ▁and ▁from ▁ 2 0 0 1 ▁under ▁the ▁current ▁title . ▁Origin ally ▁published ▁by ▁Japan ▁Medical ▁Publishing ▁Inc ., ▁the ▁journal ▁is ▁now ▁owned ▁and ▁published ▁by ▁the ▁Japan ▁Medical ▁Association . ▁ ▁J MA J ▁publish es ▁by ▁author ▁inv itation ▁only , ▁original ▁research ▁articles , ▁review ▁articles ▁(" sem in ars " ▁and ▁" re views "), ▁editor ial s , ▁book ▁reviews , ▁correspond ence , ▁as ▁well ▁as ▁news ▁features ▁and ▁case ▁reports . ▁ ▁The ▁journal ▁publish es ▁invited ▁articles