The Center for Strategic and International Studies (CSIS) [2] said in a new report that low-yield tactical nuclear warheads would be one way for the Israelis to destroy Iranian uranium enrichment plants in remote, dug-in fortifications. But other independent experts are on record warning that such a scenario is based on the "myth" of a clean atomic attack and would be too politically hazardous to justify. In "Options in Dealing with Iran's Nuclear Program" [3] by the Ploughshares-funded think tank, CSIS analysts Abdullah Toukan and Anthony Cordesman lay out the range of options available to Israel.
Links
[1] https://www.ploughshares.org/file/1643
[2] http://csis.org/
[3] http://csis.org/files/publication/100323_Options_todealwith_Iran.pdf
[4] http://af.reuters.com/article/worldNews/idAFLDE62O2HI20100326