TY - JOUR TI - On hypermatrices whose blocks are commutable in pairs and their application in lattice-dynamics T3 - Acta scientiarum mathematicarum AU - Egerváry Jenő PY - 1954 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/13750/1/math_015_211-222.pdf ER -