Baumslag Gilbert; Kovács L. G.; Neumann Bernhard Hermann: On products of normal subgroups : Gilbert Baumslag, L. G. Kovács and B. H. Neumann. In: Acta scientiarum mathematicarum, (26) 1-2. pp. 145-147. (1965)
Kovács L. G.; Neumann Bernhard Hermann: On the existence of Baur-soluble groups of arbitrary height. In: Acta scientiarum mathematicarum, (26) 1-2. pp. 143-144. (1965)
Kovács L. G.; Neumann Bernhard Hermann: An embedding theorem for some countable groups. In: Acta scientiarum mathematicarum, (26) 1-2. pp. 139-142. (1965)
Neumann Bernhard Hermann; Neumann Hanna: On linked products of groups : To Ladislaus Redei for his 60th birthday. In: Acta scientiarum mathematicarum, (21) 3-4. pp. 197-205. (1960)