The influence of urban violence and land title irregularity on the market value of properties: a case study in Belém, an Amazon Metropolis - Duarte, André Montenegro; Angelim, Elaine Cristina de Souza; Neves, Renato Martins das; Duarte, Ana Rosa C. L. M.; Maneschy, Carlos E. A.; Haddad, Emilio (Cities: the international journal of urban policy and planning, 2013)