Microscopic isolation and characterization of free living amoebae (FLA) from surface water sources.in Birjand, the capital city of the South Khorasan oleh Mahmoodreza Behravan, Mohammad Malekaneh, Behzad Mesbahzadeh, Golamreza Sharifzadeh, Mohammad Hasan Namaei, Hamed Behniafar, Zohreh Lasjerdi