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Takuji Ohyama, Hiroyuki Fujikake, Hiroyuki Yashima, Sayuri Tanabata, Shinji Ishikawa, Takashi Sato, Toshikazu Nishiwaki, Norikuni Ohtake, Kuni Sueyoshi, Satomi Ishii, Shu Fujimaki. "Effect of Nitrate on Nodulation and Nitrogen Fixation of Soybean." Soybean Physiology and Biochemistry (2011)