Theoretical study of interaction between adenine and M(+) (M=Li, Na, K, Rb, Cs) and M(2+) (M= Mg, Ca, Sr, Ba). Majid Monajjemi, Sepideh Ketabi, RezaGhiasi, Karim Zare, Hoda Passdar, Mehrnosh Karimkhani, and Leyla Saedi, 2004

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