1. The effect of area, density, and number of background characters on visual search;Drury;Human factors,1978
2. Ergonomic Guideline for Forest Machines. Handbook;Gellerstedt,1999
3. A new method for checking the driving visibility on hydraulic excavators;Hella;International Journal of Industrial Ergonomics,1991
4. Earthmoving equipment—an operator's field of view (S.A.E. Standard J1091);Hutter;Safety And Forensic Engineering Journal,2000
5. ISO, 1991. ISO standard 5006-1: testing earth-moving machinery, Part 5. Determination of operator's field of view.