TY JOUR TI On coincidence degree for fredholm perturations of pseudo-acyclic multimaps KW coincidence degree,Fredgholm operator KW pseudo-acyclic multimap JO Actual directions of scientific researches of the XXI century: theory and practice AU Al-Obaidi, D.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov