From the article by R. Evans and J. R. Henderson in J. Phys.: Condens. Matter 21 (2009) 474220

Ode to Richard Palmer and other travellers on the imaginary axis

Beware this road to Hell
Strange asymmetrical poles lie waiting
Is it really imaginary? For
Surely the integrand is odd.
Fear the curse of Derjaguin
Wonder at Casimir and Lifshitz
Trust in Widom and Enderby
To Verlet via critical Dantchev.
Risking travails of Cauchy’s Theorem
Armed only with the RPA
Taming the asymmetrical poles and
Thereby saving the correlation length.

But, be careful ...

David Goodstein wrote in the book States of Matter, 1975, Dover N.Y.

"Ludwig Boltzmann, who spent much of his life studying statistical mechanics, died in 1906, by his own hand...

Paul Ehrenfest, carrying on the work, died similarly in 1933...

Now it is our turn to study statistical mechanics.

Perhaps it will be wise to approach the subject cautiously" ...

A recent talk on critical Casimir effect  in Physics Reports Seminar Series (2023)

https://doi.org/10.52843/cassyni.5w8h75

The links to two talks on Casimir i delivered at UCLA (2019):

https://youtu.be/cvgw7y6JivY
https://youtu.be/DQ8dK-hP_fE