Fujiwara Naoya. Cryopreservation of mycorrhizal fungi : A direct cryopreservation method placing the hypha in deep freezer. 2004. 13. 1. 75-76
Fujiwara Naoya. Cryopreservation and regeneration of cherry tree winter buds : A cryopreservation method placing the shoot apex in deep freezer. 2003. 12. 1. 69-70