Karaś, M., and A. Serwatka. “Discrete-Time Market Models from the Small Investor Point of View and the First Fundamental-Type Theorem”. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, vol. 16, Jan. 2018, pp. 17-40, https://studmath.uken.krakow.pl/article/view/12969.