@misc{StockDownes, author = {Stock, Oliver and Downes, Nigel K.}, title = {Effects of additions of organic matter on the penetration resistance of glacial till for the entire water tension range}, series = {Soil \& Tillage Research}, volume = {99}, journal = {Soil \& Tillage Research}, number = {2}, issn = {0167-1987}, doi = {10.1016/j.still.2008.02.002}, pages = {191 -- 201}, language = {en} }