0000950110-99-000334 DEF 14A 1 19990414 19990312 ACNIELSEN CORP 0001019878 8700 061454128 DE 1231 DEF 14A 34 001-12277 99563786 177 BROAD STREET STAMFORD CT 06901 2038344200 177 BROAD ST STAMFORD CT 06901 DEF 14A 1 000095011099000334-001-seq1-def-14a.txt DEFINITIVE N&PS