Some Extremal Self-Dual Codes and Unimodular Lattices in Dimension 40
  In this paper, binary extremal singly even self-dual codes of length 40 and extremal odd unimodular lattices in dimension 40 are studied. We give a classification of extremal singly even self-dual codes of length 40. We also give a classification of extremal odd unimodular lattices in dimension 40 with shadows having 80 vectors of norm 2 through their relationships with extremal doubly even self-dual codes of length 40. 
Stefka Bouyuklieva, Iliya Bouyukliev and Masaaki Harada
math.CO cs.IT math.IT math.NT