On the Netto inversion number of a sequence, Proc. Amer. Math. Soc, vol.19, pp.236-240, 1968. ,
Coverage fluctuations in theater models, J. Stat. Mech, vol.2019, issue.6, p.63209, 2019. ,
DOI : 10.1088/1742-5468/ab1f0d
, of Encyclopedia of Mathematics and its Applications, vol.17, 1983.