1. A new method for checking the driving visibility on hydraulic excavators
2. ISO 5721-1:2013 Agricultural Tractors—Requirements, Test Procedures and Acceptance Criteria for the Operator’s Field of Vision—Part 1: Field of Vision to the Front,2013
3. ISO 5721-2:2014 Agricultural Tractors—Requirements, Test Procedures and Acceptance Criteria for the Operator’s Field of Vision—Part 2: Field of Vision to the Side and to the Rear,2014
4. Commission Delegated Regulation (EU) No. 2015/208http://data.europa.eu/eli/reg_del/2015/208/oj
5. Regulation of the European Parliament and of the Council (EU) No. 167/2013 on European Type Approval of Agricultural and Forestry Vehicles and Supervision over the Market with These Vehicleshttp://data.europa.eu/eli/reg/2013/167/oj