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Strachan DP. Hay fever, hygiene, and household size. BMJ. 1989;299:1259–1260.
Edwards U, Rogall T, Blöcker H, Emde M, Böttger EC. Isolation and direct complete nucleotide determination of entire genes: Characterization of a gene coding for 16S ribosomal RNA. Nucleic Acids Res. 1989;17:7843–7853.
National Research Council (NRC) Biologic Markers in Reproductive Toxicology. Washington, DC, USA: National Academic Press; 1989.
Bergh O, Borsheim KY, Bratbak G, Heldal M. High abundance of viruses found in aquatic environments. Nature. 1989;340:476–468.
Chrungoo, N. K. and Farooq, S. 1989. Influence of GA3 and NAA on certain carbohydrate fractions in corms of saffron crocus (Crocus sativus L.) during development. Acta Soc. Bot. Pol. 58: 237?246.
Chrungoo, N. K. 1989. Saffron ? a valuable cash crop. Science Reporter 279?281.
Gurung, P. B., Kumar, Y. and Tripathi, R. S. 1989. New distribution Record of Bulbophyllum wallichi (Lindl.) Rechb. f. from north-east India. Journal of Economic and Taxonomic Botany 13 (1): 89-91.
Gurung, P. B., Kumar, Y. and Tripathi, R. S. 1989. A note on new distributional of two rare and little known orchid species. Journal of Orchid Society of India 3 (1-2): 51-54.
Joshi, S. C. and Tandon, P. 1989. Association of auxin protectors in Cinnamomum tamala leaf gall formation. Indian Journal of Experimental Biology 27: 1020?1023.
Khan, M. L. and Tripathi, R. S. 1989. Survival and growth of transplanted nursery seedlings of a few subtropical trees at burnt and unburnt sites in dense and sparse forest stands. Tropical Ecology 30: 20-30.
Khan, M. L. and Tripathi, R. S. 1989. Effect of soil texture, moisture and light on emergence, survival and growth of Alnus nepalensis, Quercus griffithii, and Schima khasiana. Indian Journal of Forestry 12: 196-204.
Khan M. L. and Tripathi R. S. 1989. Effects of stump diameter, stump height and sprout density on the sprout growth of four tree species in burnt and unburnt forest plots. Acta Oecologica - Oecologica Applicata 10: 303-316.

Pandey, H. N. 1989. Agricultural ecosystem (Agroecosystem). Pages 307-335 in Manual of Plant Ecology, K. C. Misra (ed). Oxford?IBH Publishing, New Delhi.

Pandey, H. N. and Dubey, S. K. 1989. Growth and population dynamics of an exotic weed Parthenium hyterophorus Linn. Proceedings of Indian Academy of Sciences (Plant Sciences) 99: 51-58.
Pradhan, G., Gurung, P. B. and Kumar, Y. 1989. Ageratum houstonianum Mill. (Asteraceae)- a new distributional record from north-east India. Journal of Economic and Taxonomic Botany 13 (2): 413-415.
Venugopal, N. and Krishnamurthy, K. V. 1989. Organization of vascular cambium during different seasons in some tropical trees. Nordiac Journal of Botany 8: 631-638.


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