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by Helfand, Lewis; Kumar, Naresh
by Kipling, Rudyard; Helfand, Lewis (ADP); Kumar, Rakesh
by Helfand, Lewis; Singh, Lalit Kumar
by Helfand, Lewis; Nagar, Sachin
by Helfand, Lewis; Banerjee, Sankha
by Lewis Helfand
by Teitelbaum, Michael; Helfand, Lewis; Aditi, Ray; et al.