S. P. Vriend

A RQ-mode factor-analysis program for microcomputers. A Pascal program

H. de Mooy, J. T. A. van Hattum, S. P. Vriend, 1988 .

Patterns in soil quality: Natural geochemical variability versus anthropogenic impact in soils of Zeeland, The Netherlands

S. P. Vriend, P. F. M. van Gaans, J. Spijker, 2007, Int. J. Geogr. Inf. Sci..

Assessing environmental soil quality in rural areas

S. P. Vriend, S. Vriend, P. V. Gaans, 1995, Environmental monitoring and assessment.

Environmental Monitoring in The Netherlands: Past Developments and Future Challenges

S. P. Vriend, G. Mol, P. F. M. van Gaans, 2001, Environmental monitoring and assessment.