9,217 Siti Nur Jelita Sabran 2018-11-07 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1209617/pdf/444.pdf Brewbaker, J. L. (1953). Oppositional allelism in diploid and autotetraploid Trifolium hybridum L. Genetics, 38(5), 444. NULL