杨卫国, 刘杰. 关于二重有限非齐次马氏链的强大数定律[J]. 江苏大学学报（自然科学版）, 2009,30(2).

杨卫国, 刘杰. Strong laws of large numbers for second order finite nonhomogeneous Markov chains[J]. Journal of jiangsu University(Natural Science Edition), 2009, 30(2). DOI: 10.3969/j.issn.1671-7775.2009.02.023.

杨卫国, 刘杰. 关于二重有限非齐次马氏链的强大数定律[J]. 江苏大学学报（自然科学版）, 2009,30(2). DOI： 10.3969/j.issn.1671-7775.2009.02.023.

杨卫国, 刘杰. Strong laws of large numbers for second order finite nonhomogeneous Markov chains[J]. Journal of jiangsu University(Natural Science Edition), 2009, 30(2). DOI: 10.3969/j.issn.1671-7775.2009.02.023. DOI：