Learning long-term dependencies in recurrent nets, Yoshua Bengio, Patrice Simard, and Paolo Frasconi, 1994IEEE Transactions on Neural Networks, Vol. 5 (IEEE)DOI: 10.1109/72.279181 - This paper introduced the vanishing gradient problem in recurrent neural networks, a limitation explained in this section.
SimpleRNN layer - Keras documentation, Keras team, 2023 - Official documentation for the SimpleRNN layer in Keras, offering API specifications and usage examples.
Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - A canonical textbook providing theoretical background on recurrent neural networks, including the function of simple RNNs and the vanishing gradient problem.