1. Alpat’ev, N.M., 1981, Effectiveness of evaluating lucerne varieties under conditions of infection. (Rus). Selektsiya i Sememovodstvo, USSR, 3: 16.
2. Alpat’ev, N.M., Terent’eva, T.G. and Shestiterova, I.Z. 1980, The causes of the thinness of lucerne stands in the northern Causasus. (Rus). Zaschita kornovykh kul’tur ot vreditelei, bolez ei i sornyakov. “Kolos”, 61.
3. Andersson, S., 1984, First record of a yellow beet cyst nematode (Heterodera trifolii) in Sweden, Växtskyddsnotiser, 48: 11.
4. Anon, 1977, Ann.Rpt on Research and Technology of Dpt.Agric. Northern Ireland, 47: 102.
5. Bhatti, D.S. and Sassar, J.N., 1973, Pathogenicity of Heterodera lespedezae on ‘Kobe’ lespedeza, Indian J.Nematol., 2: 125.