Warrag, E.I and Mohamed Ahmed, H.K. 2003 Status of Plant Tissue Culture in Sudan. Workshop of status of plant tissue culture in the arab world. El ain – United Arab emirates

Warrag E.I 2001: Factors affecting gum Arabic yield of Acacia senegal in Kenana Site. Workshop on the yield of Acacia senegal in kenana site . July 22-25, 2001.

Warrag, E.I, A.G. Elmahi, A. M. Ibrahim, E.A. Elsheiksh 1998: Status of forest genetic resources in the Sudan. Country paper for the sub-regional workshop on the conservation, management, utilization and enhancement of forest genetic resources in dry-zone sub -saharan Africa, 16-27 March, 1998. Ouagadougou, Burkina Faso.

Rockwood, D.L., E.I. Warrag, K. Javenshir, and K. Kratz, 1989. Genetic Improvement of Eucalyptus grandis for southern Florida. Proceedings Of the 20^th Southern Forest Tree Improvement Conference, June 27-29, Charleston, South Carolina, USA. pp 403-410.

Rockwood, D.L., E.I. Warrag, J. Bryan, and K. Kratz, 1989. Recent advances in the development of Eucalyptus grandis for commercial planting for South Florida. In Proceeding 5^th Biennial Southern Silvicultural Research Conference. November 1-3, 1988, Memphis, Tennessee, USA. pp. 317-326.

Warrag, E.I., V. Ortega, M.S. Lesney, D.L. Rockwood. 1988. Recent progress in tissue culture of Eucalyptus species and implication for genetic improvement. In: proceeding of the 9^th Southern Forest Biomass Workshop. Biloxi, Mississippi. pp 71-80

Other attended International conferences

1989 Biotechnology: Science, Education, and commercialization. An International symposium, Gainesville, Florida, USA

1988  Society of American Foresters Meeting (SAF). Birmingham, Alabama

1985  The IX World Forest Congress. Mexico City, Mexico. July 1 – 12, 1985.