1. Barradas M, Bagulho F, Teixeira Duarte JM, Pereira OJ, Ferreira JT (1995) Landraces and old cultivars. Portugal: Country report to the FAO International Technical Conferences on Plant Genetic Resources. Ministry of Agriculture, Oeiras, pp 22–26
2. Brandolini A, Brandolini A (2001) Classification of Italian maize (Zea mays L.) germplasm. Plant Genet Resour Newsl 126:1–11
3. Camussi A (1979) Numerical taxonomy of Italian maize populations based on quantitative traits. Maydica 24:161–174
4. Collins GN (1930) The phylogeny of maize. Bull Torrey Bot Club 57(4):199–210
5. Costa-Rodrigues L (1971) Races of maize in Portugal. Agron Lusit 31:239–248