Single Resonators
A common IF filter in receivers from the 1930s to '50s was a single crystal in a "phasing" circuit.
Bandpass Resonator bandwidth and Q
The following presentation shows the isolation for a shunt mounted series RLC resonator. It also illustrates how to find equally spaced points on a log axis.
The Deloach measurement method for shunt mounted series RLC resonators.
Fitting an RLC model to datasheet measured data (not including any DC effects) .