Ref1

https://books.google.com.my/books?id=0kYZeDIbwogC&pg=PA66&lpg=PA66&dq=university+of+zambia+vigna+subterranea+germplasm&source=bl&ots=-1gwWn1M-R&sig=ACfU3U01al_5v7GymHCqFnzbILqPefVEag&hl=en&sa=X&ved=2ahUKEwiIvYnCwbLoAhXGeisKHZy3DOEQ6AEwAHoECAoQAQ#v=onepage&q=university%20of%20zambia%20vigna%20subterranea%20germplasm&f=false