Which online service provides the most complete list of citations to given mathematical paper? I mean the citations both in published papers and in preprints. I guess scholar.google is the best, maybe there is something more powerfull?
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In my experience google gives you much more than others, but it is not "clean" There are also Those who have subscription (me not) use MathSciNet http://www.ams.org/mathscinet/ Or european analogue http://www.zentralblattmath.org/zmath/ Also there is Russian http://www.mathnet.ru/ But it is not so developed. But it is free. Free: http://academic.research.microsoft.com/ Free: http://www.citebase.org/ Publishing houses like Springer Elseveir provide citation services, but it is mainly within their own journals... 


Apart from the ones Alexander Chervov has mentioned, there are: 

