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* C. Lanczos, R. C. Clark, G. H. Derrick (eds.), Ch. 3 in: *Mathematical Methods in Solid State and Superfluid Theory*, Springer (1986) $[$[doi:10.1007/978-1-4899-6435-9](https://doi.org/10.1007/978-1-4899-6435-9)$]$
<a href="https://ncatlab.org/nlab/revision/diff/superfluid/3">diff</a>, <a href="https://ncatlab.org/nlab/revision/superfluid/3">v3</a>, <a href="https://ncatlab.org/nlab/show/superfluid">current</a>
added pointer to:
C. Lanczos, R. C. Clark, G. H. Derrick (eds.), Ch. 3 in: Mathematical Methods in Solid State and Superfluid Theory, Springer (1986) doi:10.1007/978-1-4899-6435-9