56 citations · 269 across the 60 of their papers we have counts for
62 papers
Hadamard matrices of orders 60 and 64 with automorphisms of orders 29 and 31
Makoto Araya, Masaaki Harada, Vladimir D. Tonchev
A classification of Hadamard matrices of order with an automorphism of order is given for and . The ternary self-dual codes spanned by the newly found Hadamar…
Ternary extremal four-negacirculant self-dual codes
Masaaki Harada, Keita Ishizuka, Hadi Kharaghani
In this note, we give basic properties of ternary four-negacirculant self-dual codes. By exhaustive computer search based on the properties, we complete a classification of ternary…
Hadamard matrices of order formed by codewords in some ternary self-dual codes
Masaaki Harada, Keita Ishizuka
In this note, we study the existence of Hadamard matrices of order formed by codewords of weight in some ternary near-extremal self-dual codes of length .
Some restrictions on the weight enumerators of near-extremal ternary self-dual codes and quaternary Hermitian self-dual codes
Makoto Araya, Masaaki Harada
We give restrictions on the weight enumerators of ternary near-extremal self-dual codes of length divisible by and quaternary near-extremal Hermitian self-dual codes of length…
Self-dual codes over and -extremal unimodular lattices
Masaaki Harada
New -extremal extremal unimodular lattices in dimensions , , and are constructed from self-dual codes over by Construction A. In the process of…
Hadamard matrices related to a certain series of ternary self-dual codes
Makoto Araya, Masaaki Harada, Koji Momihara
In 2013, Nebe and Villar gave a series of ternary self-dual codes of length for a prime congruent to modulo . As a consequence, the third ternary extremal self-…