Rubuta ci gaba ga wannan sakin layi - Bayan mamayewar Soviet zuwa Czechoslovakia
a 1968, Kulka ya yi hijira zuwa Isra'ila. Ya ci gaba da ayyukan bincikensa a Jami'ar Ibrananci da kuma cibiyar Yad Vashem wanda ya haifar da binciken farko a tarihi da ya shafi muhimmiyar halartar yahudawa daga Jamhuriyar Czech da Slovakia a yakin duniya na biyu don 'yantar da Czechoslovakia: ""Yahudawa a cikin sojojin Svoboda a Tarayyar Soviet" da "Yahudawa a cikin Sojojin Czechoslovak a Yamma"".