1. A theory for optimalization of primary production in protected cropping. 2. Primary plant production with different outdoor light regimes;Enoch;Acta Hort.,1978
2. Energy and Food Production;Leach,1975
3. Towards an economics of energy in horticulture;Storck;Acta Hort.,1978
4. Energy analysis;I.F.I.A.S.,1974
5. Energy requirements for agriculture in California;Cervinka,1974