Effect of smoke-water and a smoke-isolated butenolide on the growth and genotoxicity of commercial onion, Kulkarni, M.G., Ascough G.D., Verschaeve Luc, Baeten K., Arruda M.P., and Van Staden J. , Scientia Horticulturae, Jan-05-2010, Volume 124, Issue 4, Number 439, (2010)