1. Monea, C., Iana, G.V., Ionita, S., Ionescu, L.M., Zaharia, S.A., Ilie, S., Bizon, N.: An optimized NQR spectrometer for detection of prohibited substances. Meas. 151, 107158 (2019)
2. Gregorovič, A., Apih, T.: WURST–QCPMG sequence and ‘spin-lock’ in 14N nuclear quadrupole resonance. J. Magn. Reson. 233, 96–102 (2013)
3. Mandal, S., Song, Y.Q.: Method and system for applying NQR pulse sequences. Patent, WO2013134474 (2013)
4. Lužnik, J., Pirnat, J., Jazbinšek, V., Lavrič, Z., Srčič, S., Trontelj, Z.: The influence of pressure in paracetamol tablet compaction on 14N nuclear quadrupole resonance signal. Appl. Magn. Reson. 44(6), 735–743 (2013)
5. Buess, M.L., Garroway, A.M., Miller, J.B., Yesinowski J.P., Lindquist,, R.P.: Method and apparatus for detecting a target material in a sample by pre-screening the sample for piezoelectric resonance. Patent, US7132942B1 (2005)