J. D. Hanson. The virtual-casing principle and Helmholtz's theorem. Plasma Phys. and Contr. Fusion, 57(11):115006, sep 2015.

S. P. Hirshman and J. Breslau. Explicit spectrally optimized Fourier series for nested magnetic surfaces. Phys. Plas., 5(7):2664–2675, 1998.

S. P. Hirshman and H. K. Meier. Optimized Fourier representations for three‐dimensional magnetic surfaces. Phys. Fluids, 28(5):1387–1391, 1985.

S. R. Hudson, R. L. Dewar, M. J. Hole, and M. McGann. Non-axisymmetric, multi-region relaxed magnetohydrodynamic equilibrium solutions. Plasma Phys. and Contr. Fusion, 54(1):014005, dec 2011.

S. A. Lazerson, S. Sakakibara, and Y. Suzuki. A magnetic diagnostic code for 3D fusion equilibria. Plasma Phys. and Contr. Fusion, 55(2):025014, jan 2013.

S. A. Lazerson. The virtual-casing principle for 3D toroidal systems. Plasma Phys. and Contr. Fusion, 54(12):122002, nov 2012.

V. D. Shafranov and L. E. Zakharov. Use of the virtual-casing principle in calculating the containing magnetic field in toroidal plasma systems. Nucl. Fusion, 12(5):599–601, sep 1972.

C. Zhu, S. R. Hudson, Y. Song, and Y. Wan. New method to design stellarator coils without the winding surface. Nucl. Fusion, 58(1):016008, nov 2017.