Hachuła, P., Schmeidel, E. (2015). <em>Stability Analysis of Demand-Inventory Modeling a Certain Business Case</em>, in Transcom Proceedings, 22–24 June 2015 (CD), University of Zilina.
Hachuła, P., Nockowska-Rosiak, M., Schmeidel, E. (2016). Stability of Equilibrium Points of Demand-Inventory Model with Stock-Dependent Demand. <em>Journal of Difference Equations and Applications</em>. DOI: <a href="https://doi.org/10.1080/10236198.2016.1208188." target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1080/10236198.2016.1208188.</a><dgdoi:pub-id xmlns:dgdoi="http://degruyter.com/resources/doi-from-crossref" pub-id-type="doi"><a href="https://doi.org/10.1080/10236198.2016.1208188" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1080/10236198.2016.1208188</a></dgdoi:pub-id>
Iskra, E., Woźniak, K. (2014). <em>Cykl życia produktu</em>. Encyklopedia zarządzania. Available at: <ext-link ext-link-type="uri" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://mfiles.pl/pl/index.php/Cykl_zycia_produktu">http://mfiles.pl/pl/index.php/Cykl_zycia_produktu</ext-link> (access: 18.08.2015).
Ma, J., Feng, Y. (2008). The Study of the Chaotic Behaviour in Retailer’s Demand Model. <em>Discrete Dynamics in Nature and Society</em>. DOI: <a href="https://doi.org/10.1155/2008/792031." target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1155/2008/792031.</a><dgdoi:pub-id xmlns:dgdoi="http://degruyter.com/resources/doi-from-crossref" pub-id-type="doi"><a href="https://doi.org/10.1155/2008/792031" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1155/2008/792031</a></dgdoi:pub-id>