@ARTICLE{Sikora_Z._A_2011,
 author={Sikora, Z. and Cieśla, P.},
 number={No 2},
 journal={Archives of Civil Engineering},
 pages={139-151},
 howpublished={online},
 year={2011},
 publisher={WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES},
 abstract={The article describes how to identify the boundary and yield surface for hypoplastic constitutive equations proposed by Wu, Gudehus and Bauer. It is shown how to identify and plot the surfaces for any equation in this class. Calculation errors are analyzed characteristic for applied set of numerical formulas. In the paper there are computer links to the source code prepared in the MATLAB system, based on instructions in the article. A sample consitutive domains are shown, plotted using the attached computer program.},
 type={Artykuły / Articles},
 title={A graphical approach to yield and boundary surfaces of selected hypoplastic constitutive equations},
 URL={http://journals.pan.pl/Content/83758/mainfile.pdf},
 keywords={yield surface, boundary surface, hypoplasticity, constitutive equation, MATLAB function, constitutivedomain, soil mechanics, finite element method, simulation},
}