1. Well - posedness of fixed point problems Far East Mathematical Special volume Part III;Reich;Journal Sciences,2001
2. Sur la porosite des contractions sans point fixe Academie;De Blassi;Sciences,1989
3. Well - posedness and porosity of certain classes of operators Demonstratio;Lahiri;Math,2005
4. On some maps with non - unique fixed points Publ Inst Belgrad;Ćirić;Math,1974