Yuval Ishai Tal Malkin Martin J. Strauss Rebecca N. Wright Private multiparty sampling and approximation of vector combinations. 1730-1745 2009 410 Theor. Comput. Sci. 18 http://dx.doi.org/10.1016/j.tcs.2008.12.062 db/journals/tcs/tcs410.html#IshaiMSW09