Akhter, M. T., Mannan, M., Kundu, P., & Paul, N. (2015). Effects of different sowing dates on the phenology and accumulated heat units in three rapeseed (Brassica campestris L.) varieties. Bangladesh Journal of Botany, 44(1), 97–101. https://doi.org/10.3329/bjb.v44i1.22730