documentclass[a4paper]{report}
 usepackage{graphicx}
 usepackage[latin1]{inputenc}
 usepackage[T1]{fontenc}
 usepackage[english]{babel}
 %usepackage[style=authortitle-icomp]{biblatex}
 usepackage{lmodern}
 usepackage[backend=biber,bibencoding=latinl]{biblatex}
 %addbibresource{folder/references.bib}
 begin{document}
my report here
printbibliography
end{document}

@book{ref1,
isbn = {3-662-45239-1},
title = {Scanning Probe Microscopy},
language = {eng},
author = {Voigtländer, Bert},
publisher = {Springer Berlin Heidelberg},
}

documentclass[a4paper]{report}

usepackage[backend=biber,bibencoding=latin1]{biblatex}
addbibresource{references.bib}

begin{document}

My report here cite{ref1}.

printbibliography

end{document}