1. Abrigo WM, Novero AU, Coronel VP, Cabuslay GS, Blanco LC, Parao FT, Yoshido AS (1985) Somatic cell culture at IRRI. Biotechnology in International Agricultural Research. IRRI, Manila, Philippines, p 149
2. Al-Hiyaly SAK (1989) Evolution of zinc tolerance under electricity pylons. PhD Thesis, University of Liverpool, Liverpool
3. Al-Khatib M (1991) Salinity tolerance breeding in lucerne. PhD Thesis, University of Liverpool, Liverpool
4. Allen WR, Sheppard PM (1971) Copper tolerance in some Californian populations of the monkey flower, Mimulus guttatus. Proc R Soc Lond Ser B 177: 177–196
5. Andrew CS, Hegarty MP (1969) Comparative responses to manganese excess of eight tropical and four temperate legumes. Aust J Agric Res 20: 687–696