6. References

Krause, R., F. Lorenz and W. B. Hoogmoed: Soil tillage in the tropics and subtropics. Schriftenreihe der GTZ No. 150, Eschborn 1984, p. 320.

Derpsch, R., C. H. Roth, N. Sidiras and U. K: Erosionsbekfung in Parana, Brasilien: Mulchsysteme, Direktsaat und konservierende Bodenbearbeitung. Schriftenreihe der GTZ No. 205, Eschborn 1988, p. 270.

Zweier, K.: Energetische Beurteilung von Verfahren und Systemen in der Landwirtschaft der Tropen und Subtropen - Grundlagen und Anwendungsbeispiele. Forschungsbericht Agrartechnik des Arbeitskreises Forschung und Lehre der Max-Eyth-Gesellschaft (MEG), Band 115, 1985, p. 341.

GTZ: Sustainable agriculture in German and Swiss technical cooperation. Register Nr. 15 der "Working paper for rural development", GTZ, Division 4210, Farming Systems, Eschborn, Feb. 1989, p. 148.

UNEP: Agricultural mechanisation. No., UNEP environmental management guidelines, United Nations Environment Programme, Nairobi, 1986, p. 17.

FAO: Agricultural mechanisation in development - guidelines for strategy formulation. Agricultural Services Bulletin 45, Rome 1984, p. 77.

World Bank: Agricultural Mechanisation - Issues and Options. A World Bank policy study. Washington D. C., June 1987, p. 85.

Examples of German regulations and standards:

BBA: Regulations laid down by the Biologische Bundesanstalt (BBA - German Federal Biological Research Centre for Agriculture and Forestry) concerning use of pesticides.

Berufsgenossenschaften: Accident prevention regulations (Unfallverhvorschriften) laid down by agricultural and industrial employers' liability insurance associations ("Berufsgenossenschaften").

DIN: German Standards and regulations on construction and design.

STVZO: Provisions of the German road transport licensing regulations.

TA L: Technical Instructions on Noise Abatement, 1968/1974.

TA Luft: Technical Instructions on Air Quality Control. First general administrative regulation accompanying the Federal Immission Control Act,

27 February 1986.