The Supreme Court on Monday sought the stands of the Centre and the Election Commission on Janata Party chief Subramanian Swamy's plea to incorporate either paper printouts with EVMs or restore paper balloting as the electronic machines are "not tamper-proof".Issuing notices to the Centre and the poll panel, a bench of justices P Sathavisam and J Chelameswar sought their replies on Swamy's plea, which challenged the Delhi high court's order dismissing his petition.