TY - JOUR AU - Alberto Cavicchioli AU - Friedrich Hegenbarth AU - Fulvia Spaggiari TI - $PD_4$-complexes: constructions, cobordisms and signatures JO - Homology, homotopy, and applications PY - 2016 SP - 267 EP - 281 VL - 18 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4310/HHA.2016.v18.n2.a15/ DO - 10.4310/HHA.2016.v18.n2.a15 LA - en ID - HHA_2016_18_2_a14 ER -