TY - JOUR AU - Bubboloni, Daniela TI - Graph homomorphisms and components of quotient graphs JO - Rendiconti del Seminario Matematico della Università di Padova PY - 2017 SP - 39 EP - 60 VL - 138 PB - European Mathematical Society Publishing House PP - Zuerich, Switzerland UR - http://www.numdam.org/articles/10.4171/RSMUP/138-2/ DO - 10.4171/RSMUP/138-2 ID - RSMUP_2017__138__39_0 ER -