The Ryukyuan languages (琉球語派, Ryūkyū-goha, also 琉球諸語, Ryūkyū-shogo or 島言葉 in Ryukyuan, Shima kutuba, literally "Island Speech"), also Lewchewan or Luchuan...

"分岐学的手法に基づいた日本語・琉球語諸方言の系統分類の試み" [An attempt at the systematic classification of Japanese and Ryukyuan Languages using cladistic methods]. フィールドと文献から見る日琉諸語の系統と歴史...