===== Two-Dimensional 4He =====
* Heat capacity of fluid monolayers of 4He
Dennis S. Greywall and Paul A. Busch
Phys. Rev. Lett. 67, 3535 (1991) [[https://doi.org/10.1103/PhysRevLett.67.3535]]

* Heat capacity and the commensurate-incommensurate transition of 4He adsorbed on graphite
Dennis S. Greywall, Phys. Rev. B 47, 309 (1993) [[https://doi.org/10.1103/PhysRevB.47.309]]

* Superfluidity and film structure in 4He adsorbed on graphite
P. A. Crowell and J. D. Reppy
Phys. Rev. B 53, 2701 (1996) [[https://doi.org/10.1103/PhysRevB.53.2701]]

==== Structure ====
* Neutron diffraction studies of 2D quantum systems.
H.J. Lauter, H.P. Schildberg, H. Godfrin, H. Wiechert, R. Haensel.
Canadian Journal of Physics, 65 (1987) 1435-1439

* Helium 4 films on graphite studied by neutron scattering.
H.J. Lauter, H. Godfrin and P. Leiderer.
J. Low. Temp. Phys. 87, 425-443 (1992).

==== Dynamics ====
* Ripplons in 4He films observed by neutron scattering.
H.J. Lauter, H. Godfrin, V.L.P. Frank and P. Leiderer.
Phys. Rev. Lett. 68, 2484-2487 (1992).

* Excitations in a thin liquid 4He film from inelastic neutron scattering
B.E. Clements, H. Godfrin, E. Krotscheck, H.J. Lauter, P. Leiderer, V. Passiouk and C.J. Tymczac.
Phys. Rev. B 53, 12242-12252 (1996).

==== Supersolids ====
* On the ‘Supersolid’ Response of the Second Layer of 4He on Graphite, Nyéki, J., Phillis, A., Cowan, B. et al.  J Low Temp Phys 187, 475–481 (2017).[[ https://doi.org/10.1007/s10909-017-1779-x]]