English: Change of Distribution of Nymphaea tetragona Georgi and Nuphar pumilum DC. var. ozeense H. Hara in an Interval of 16 years on the Basis of Pool Catalog Database of the Ozegahara Moor, Central Japan
Japanese: 尾瀬ケ原の池溏データベースによるヒツジグサとオゼコウホネの16年間の分布消長