Systematics in the superconducting and normal state properties in chemically substituted MgB$_{2}$
Systematics of c-axis Phonons in the Thallium and Bismuth Based Cuprate Superconductors
Systematics of the temperature-dependent inter-plane resistivity in Ba(Fe$_{1-x}$T$_x$)$_2$As$_2$ with T= Rh, Ni, and Pd
Systematics of two-component superconductivity in $YBa_{2}Cu_{3}O_{6.95}$ from microwave measurements of high quality single crystals