 new factor evalu scientif literatur through citat index more citat scientif literatur process citat index project institut scientif inform the project sponsor nsf nih describ method citat data evalu public discuss summari statist data compil comput method 1 frequenc citat journal 2 frequenc current citat literatur 3 frequenc self-citat journal author 4 number sourc citat cite paper 5 number refer sourc paper 6 number paper publish journal 