ers, L.P., 9 F.3d 230, 235 (2nd Cir. 1993) ("voluntary disclosure of work product to an adversary waives the privilege as to other parties"); In re Chrysler Motors Overnight Evaluation Litigation, 860 F.2d 844, 846-47 (8h 1988) (defendant company's disclosure of computer tape to class counsel during settlement negotiated waived work product