[mars]

Wu, Fa Xian (吳法憲 / 吴法宪) could hardly access PLA "internal documents" when he was writing his memoirs, I would guess his source is memoirs of Ye, Fei (葉飛/叶飞) who is an army guys, anyway I will later check memoirs of General Hu Lin (林虎), who actually participated in these air combat. But anyway, I am not saying the "7" is necessary right or the figure "20+" is necessary wrong, all I am saying is until Mainland Chinese military record open to public, we will no way be sure