Pearson K. (1901), On lines and planes of closest fit to systems
of points in space. The London, Edinburgh, and Dublin Philosophical
Magazine and Journal of Science, 2(11), 59-572,
https://doi.org/10.1080/14786440109462720
York, D. (1966). Least-squares fitting of a straight line.
Canadian Journal of Physics, 44(5), 1079<U+2013>1086,
https://doi.org/10.1139/p66-090