TY - JOUR TI - A forbidden substructure characterization of Gauss codes T3 - Acta scientiarum mathematicarum AU - Lovász László PY - 1976 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/14565/1/math_038_fasc_001_002_115-119.pdf ER -