URN:NBN:SI:doc-GDQGC4XH1990documents/doc/G/URN_NBN_SI_doc-GDQGC4XH_001.pdfdocuments/doc/G/URN_NBN_SI_doc-GDQGC4XH_001.txt(1990), str.93-95article22668544URN:NBN:SI:doc-GDQGC4XHslvObzorjaOtrok in knjigaInCNovak, Boris A.: Periskop