Proceedings of the International Conference on Digital Audio Effects (DAFx). All open access at https://dafx.de/
Jon Dattorro's Effect Design papers:
https://ccrma.stanford.edu/~dattorro/EffectDesignPart1.pdf
https://ccrma.stanford.edu/~dattorro/EffectDesignPart2.pdf
https://ccrma.stanford.edu/~dattorro/EffectDesignPart3.pdf
Vadim Zavalishin - The Art Of VA Filter Design https://www.native-instruments.com/fileadmin/ni_media/downlo...
Proceedings of the International Computer Music Conference (open access) https://quod.lib.umich.edu/i/icmc/
Andy Farnell, "Designing Sound"
A standard introductory DSP textbook such as Ifeachor and Jervis, Orfanidis, Oppenheim and Schafer.
"The Computer Music Tutorial" and "Microsound" by Curtis Roads
Audio Anecdotes book series
"Music, Cognition and Computerised Sound", edited by Perry Cook
what am I missing?