1. BATTAGLIA, E., 1963. Apoximis. Recent advances in the embryology of Angiosperms. (Ed. P. Maheshwari.) Intern. Soc. of plant Morphologists, Univ. of Delhi, pp. 221–264.
2. On apospory in ferns;BOWER;J. Linn. Soc., Bot.,1886
3. Problems in breeding and cytology of sugar cane;BREMER;Euphytica,1963
4. Aposporia e apogamia in “Artemisia nitida”;CHIARUGI;Bertol. Nuovo Giorn. bot. ital., Nuovo Ser.,1926
5. CLAUSEN, J., 1954. Partial apomixis as an equilibrium system in evolution. Proceed of the 9th intern. congr. of genetics, Part I, Caryologia, Vol. VI, Suppl., pp. 469–479.