On the approximate calculation of double integrals with weight functionArro, Voldemar1995 https://www.ester.ee/record=b1067579*est

On the approximate calculation of double integrals with weight functionArro, VoldemarProceedings of the Estonian Academy of Sciences. Physics. Mathematics2000 / 2, p. 67-74 https://artiklid.elnet.ee/record=b1004121*est