Studies on Heterosis for Yield and Its Related Traits in Single and Double Low Cytoplasmic Male Sterile Hybrid of Brassica napus.
Zhang Shufen, Fu Tingdong, Song Wenguang
ACTA AGRICULTURAE BOREALI-SINICA . 1994, (S1): 51 -56 .  DOI: 10.3321/j.issn:1000-7091.1994.z1.011