Volume 17, Issue 2,1999, Pages 113-114, doi:10.3760/cma.j.issn.1001-9391.1999.02.124
Volume 17, Issue 2,1999, Pages 119-120, doi:10.3760/cma.j.issn.1001-9391.1999.02.129
Volume 17, Issue 2,1999, Pages 123-124, doi:10.3760/cma.j.issn.1001-9391.1999.02.132