1. Determinazione dell area fogliare in barbabietola da zucchero (Beta vulgaris L. saccharifera);Barbieri;Rivista de Agronomia,1983
2. Bornscheuer, E., 1969. Saatgutfibel-Zuckerrübe, KWS Kleinwanzlebener Saatzucht ag. 25.
3. Seed production and quality;Bornscheuer,1993
4. Yield and sugar production by sugar beets as affected by leaf area variations induced by stand density and nitrogen fertilization;Campbell;Agron. J.,1967
5. Sugar beet seed production in Oregon, USA;Campbell,1968