@article{oai:aue.repo.nii.ac.jp:00004861,
 author = {Nozaki, Hiroshi and Suda, Sho},
 issue = {1},
 journal = {Journal of algebraic combinatorics},
 month = {Aug},
 note = {text, Mutually unbiased weighing matrices (MUWM) are closely related to an antipodal spherical code with 4 angles. In this paper, we clarify the relation between MUWM and the spherical codes, and determine the maximum size of a set of MUWM with weight 4 for any order. Moreover, we define mutually quasi-unbiased weighing matrices (MQUWM) as a natural generalization of MUWM from the viewpoint of spherical codes. We determine the maximum size of a set of MQUWM for the parameters (d, 2, 4, 1) and (d, d, d/2, 2d). This includes an affirmative answer to the problem of Best, Kharaghani, and Ramp.},
 pages = {283--291},
 title = {Weighing matrices and spherical codes},
 volume = {42},
 year = {2015}
}