RESEARCH ALERT-Citigroup raises Ratio to buy

Oct 2 (Reuters) - Ratio Oil :

* Citigroup raises Ratio to buy from neutral

* Citigroup raises Avner Oil Exploration LP target price to shekels

3.29 from shekels 3.07; rating buy

* Citigroup raises Delek Drilling LP target price to shekels 18.15

from shekels 16.92; rating buy

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