How do you say interest in Shanghai dialect?

After the opening of Shanghai, the evolution of dialects has accelerated due to the rapid growth of population, the expansion of jurisdiction, the drastic social changes and the promotion of mixed immigrants from all over the world. Among them, the remarkable feature of the evolution of urban dialects is the continuous simplification and convergence to northern mandarin.

According to the available data, the evolution of Shanghai dialect from the middle of19th century to the present can be roughly divided into three periods. And these three periods can find some relevant academic works as the basis.