Self-enrollment papers can be written according to personal specialties, so as to ensure the originality of the papers. Self-enrollment and publication of papers can be found in periodicals and magazines. Academic papers are generally divided into three levels: provincial, national and core. Extended materials Self-enrollment papers can be written according to personal specialties, so as to ensure the originality of the papers. Self-enrollment and publication of papers can be found in periodicals and magazines. Academic papers are generally divided into three levels: provincial, national and core.