@BOOK {NIELSEN:2002, title = {Analysis of herbicide dose response bioassays using non-linear mixed modelling}, editor = {Nielsen, O. and Ritz, C. and Streibig, J. }, booktitle = {Conference Poster at Annual Weed Science Society of Nigeria meeting.}, year = {2002}, publisher = {Nigerian Institute for oil Pal Research,}, address = {Benin City, Nigeria}, }