Malik, MA. “Study of Crossability and F<sub>1< sub> of Interspecific Hybridization Between <i>Brassica rapa< i> (<i>B. campestris< i>) and <i>B. nigra< I>”;. Bangladesh Journal of Agricultural Research, vol. 32, no. 3, Jan. 2008, pp. 445-9, doi:10.3329/bjar.v32i3.546.