Define 'Highly Cited'

It might be this:

LeCun, Y., Bottou, L., Bengio, Y., & Haffner, P. (1998). Gradient-based learning applied to document recognition. Proceedings of the IEEE, 86(11), 2278-2324.

This paper introduced convolutional (weight-sharing) networks - now popularly known as Deep Neural Networks - and showed they could be used in real-world problems. Cited 24,100 times, according to  Google Scholar (2020-01-29) - over 1,000 citations per year on average.

Oh and - psychologists take note - published in conference proceedings.

Not a one off. How about this conference paper. It's by Simonman & Zisserman, it's a development of the LeCun paper, it was published in 2009, and has averaged 5,500 citations per year.