J. A.  Doyle and Le Thomas, A., ?Evolution of pollen characters and relationships of African Annonaceae: Implications of a cladistic analysis?, 2nd Symposium on African Palynology, vol. 31. CIFEG, Tervuren (Belgium), pp. 241-254, 1995.

J. A.  Doyle and Le Thomas, A., ?Evolution of pollen characters and relationships of African Annonaceae: Implications of a cladistic analysis?, 2nd Symposium on African Palynology, vol. 31. CIFEG, Tervuren (Belgium), pp. 241-254, 1995.