Karashima 1992 Karashima, Keishi (1993). «法華経における乗(yâna)と智慧 (jñâna)—大乗仏教における (yâna) の概念の起源について Hokkekyò ni okeru jò (yâna) to chie (jñâna)—daijò bukkyò ni okeru yâna no gainen no kigen [Vehicle (yâna) and Wisdom (jñâna) in the Lotus Sutra: On the origin of the concept of Yâna in Mahayana Buddhism]». I Taga Ryūgen. 法菩経の受容と展開 [The Acceptance and Development of the Lotus Sutra]. Heirakuji Shoten, Kyoto, 1993.
Karashima 1993 Karashima, Keishi (1993). «法華経における乗(yâna)と智慧 (jñâna)—大乗仏教における (yâna) の概念の起源について Hokkekyò ni okeru jò (yâna) to chie (jñâna)—daijò bukkyò ni okeru yâna no gainen no kigen [Vehicle (yâna) and Wisdom (jñâna) in the Lotus Sutra: On the origin of the concept of Yâna in Mahayana Buddhism]». I Taga Ryūgen. 法菩経の受容と展開 [The Acceptance and Development of the Lotus Sutra]. Heirakuji Shoten, Kyoto, 1993.