Long Short-Term Memory, Sepp Hochreiter, Jürgen Schmidhuber, 1997Neural Computation, Vol. 9 (MIT Press)DOI: 10.1162/neco.1997.9.8.1735 - The original paper introducing the Long Short-Term Memory (LSTM) architecture, fundamental for understanding its gating mechanisms.
Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - A standard textbook chapter providing a comprehensive explanation of recurrent neural networks, LSTMs, and GRUs.