[n] E. Regenstreif, “Phase Space Acceptance of a Quadrupole Doublet Analytic Expressions and Numerical Results”, in Proc. LINAC'68, Long Island, NY, USA, May 1968, paper E-5, pp. 353-356.
[n] E. Regenstreif and P. Tanguy, “Phase-Space Representation of Aberrations Due to Longitudinal Fields in Quadrupoles”, in Proc. LINAC'66, Los Alamos, NM, USA, Oct. 1966, paper V-10, pp. 245-249.
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