Archive Mathematical Physics and Computer Simulation. 2020. Vol. 23 No. 2 MATHEMATICS AND MECHANICS Klyachin A.A., Panchenko A.G. Error Estimation of Area Calculation for Piecewise Polynomial Approximation 
https://doi.org/10.15688/mpcm.jvolsu.2020.2.2
Aleksey A. Klyachin
Doctor of Physical and Mathematical Sciences,
Head of the Department of Mathematical Analysis and Function Theory,
Volgograd State University
