共 25 条
- [1] BARROWS WB, 1888, 1888 COMM AGR ANN RE, P498
- [2] Beal F., 1910, USDA BIOL SURVEY B, V34
- [3] BORNEBUSCH C. H., 1939, Dansk Skovforeningens Tidsskrift, V1, P1
- [4] Brown H. Leo, 1947, TRANS KANSAS ACAD SCI, V50, P28, DOI 10.2307/3625656
- [6] COLLINGE WE, 1913, J BD AGR, V20, P15
- [7] DORPHPETERSEN K, 1925, 4TH INT SEED TEST C, P124
- [8] FRIED LA, 1938, THESIS U MINN
- [9] HARVEY BT, 1915, PL WORLD, V18, P217
- [10] JUDD SD, 1901, USDA BIOL SURV B, V15