Busscher W., Lipiec J.:  Eastern Europe: w does conservation fit in? (2004 r.) Journal of Soil and Water Conservation 2004, J. Soil Water Conserv., 59, 2, 30a-33a 

Busscher W., Lipiec J., Bauer P., Carter T.:  Improved root penetration of soil hard layers by a selected genotype. (2000 r.) Communications in Soil Science and Plant Analysis 2000, 31, (19&20), 3089-3101 

Busscher W., Lipiec J., Bauer P., Carter T.:  Root penetration of artificially compacted hard layers. (1997 r.) Bibliotheca Fragmenta Agronomica 1997, 2A/97, 119-122