1. A note on the spectra of tridiagonal matrices. (18th July 2004) Authors: da Fonseca, C. M.; Petronilho, J. Journal: International journal of mathematics and mathematical sciences Issue: Number 30(2004) Page Start: 1575 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. A proof of a conjecture about a symmetric system of orthogonal polynomials. Issue 4 (2nd April 2020) Authors: Castillo, K.; de Jesus, M. N.; Petronilho, J. Journal: Integral transforms and special functions Issue: Volume 31:Issue 4(2020) Page Start: 299 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. On classical orthogonal polynomials related to Hahn's operator. Issue 6 (2nd June 2020) Authors: Álvarez-Nodarse, R.; Castillo, K.; Mbouna, D.; Petronilho, J. Journal: Integral transforms and special functions Issue: Volume 31:Issue 6(2020) Page Start: 487 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. On discrete coherent pairs of measures. Issue 7 (3rd July 2022) Authors: Álvarez-Nodarse, R.; Castillo, K.; Mbouna, D.; Petronilho, J. Journal: Journal of difference equations and applications Issue: Volume 28:Issue 7(2022) Page Start: 853 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗