[1]J. Hawrysz и H. De Ruiter, PMI, т. 167, вып. 2, сс. 335-338, апр. 2006.

[1]J. Hawrysz and H. De Ruiter, "Smart Partnership for Higher Education: European Mineral Masters Engineering Course", PMI, vol. 167, no. 2, pp. 335-338, Apr. 2006.