1. Abe J (1995a) What is cold to crops? Overwintering mechanisms in winter cereals and forage crops. Nougyo Oyobi Engei 70:561–564 (in Japanese)
2. Abe J (1995b) Freezing tolerance in grasses. Bull Hokkaido Turfgrass Res Assoc 19:3–10 (in Japanese)
3. Abe J, Yoshida M (1997) Influence of water and air temperature on cold hardiness of wheat. Acta Agron Hung 45:223–229
4. Adachi A, Miyashita Y, Araki H (1976) On the varietal differences in winter survival of perennial ryegrass, Lolium perenne L. Res Bull Hokkaido Natl Agic Exp Stn 114:173–193 (in Japanese)
5. Amano Y (1987) Studies on method of breeding wheat for winter hardiness. Rept Hokkaido Pref Agric Exp Stn 64:79, in Japanese