Information Journal Paper
APA:
CopyHELPMAN, E.. (1993). INNOVATION, IMITATION, AND INTELLECTUAL PROPERTY RIGHTS. ECONOMETRICA, 61(-), 1247-1280. SID. https://sid.ir/paper/605900/en
Vancouver:
CopyHELPMAN E.. INNOVATION, IMITATION, AND INTELLECTUAL PROPERTY RIGHTS. ECONOMETRICA[Internet]. 1993;61(-):1247-1280. Available from: https://sid.ir/paper/605900/en
IEEE:
CopyE. HELPMAN, “INNOVATION, IMITATION, AND INTELLECTUAL PROPERTY RIGHTS,” ECONOMETRICA, vol. 61, no. -, pp. 1247–1280, 1993, [Online]. Available: https://sid.ir/paper/605900/en