Mezue ahịrịokwu na-esonụ: Zieleniec nọrọ ọtụtụ n'ime ọrụ ya dị ka onye na-akụnụba. Site na 1973 ruo mgbe
ọdịda nke ọchịchị Kọmunist na 1989, ọ rụrụ ọrụ mbụ dị ka onye nyocha na Institute of Research in Engineering Technology and Economics Research, na mgbe e mesịrị na Institute of Economics nke Czechoslovak Academy of Sciences. Ewezuga nyocha na usoro akụ na ụba micro, ọ rụrụ ọrụ na nsogbu nke mgbanwe akụ na ụba site na atụmatụ etiti gaa n'ahịa ahịa. Ọmụmụ ihe "Czechoslovakia na crossroads", dabere na nyocha ya, nwere mmetụta dị ịrịba ama na mkparịta ụka banyere mgbanwe mgbanwe akụ na ụba mgbe 1989.