SIRGHI, N., NEAMTU, M., MIRCEA, G., & RAMESCU, D. (2019). The deterministic model with time delay for a new product diffusion in a market. Timisoara Journal of Economics and Business, 11(1), 55-66. Retrieved from http://tjeb.ro/index.php/tjeb/article/view/TJEB-vol11-2018-iss1-art4-SIRGHI