@article{oai:teapot.lib.ocha.ac.jp:00034934,
 author = {Iwata, Giiti and 岩田, 義一},
 issue = {1},
 journal = {お茶の水女子大學自然科學報告},
 month = {Jul},
 note = {application/pdf, 紀要論文, Formulas to express the mean value of a polynomial of degree up to 5 over a tetrahedron by a linear combination of the values of the polynomial at the least set of points within the tetrahedron are established and applied to a few functions to estimate errors comprised.},
 pages = {39--47},
 title = {Approximate Formulas for the Mean Value of a Function over a Tetrahedron},
 volume = {21},
 year = {1970}
}