31. Ferreira Mário F. S., Paul Mukul Chandra. 2021.Introduction to the Special Issue on Optical Fiber Sources and Amplifiers, Fiber and Integrated Optics, DOI:10.1080/01468030.2020.1860440
32. Rey-García Francisco, Ibáñez Rafael, Angurel Luis Alberto, Costa Florinda M., de la Fuente Germán F.. 2021.Laser Floating Zone Growth: Overview, Singular Materials, Broad Applications, and Future Perspectives, Crystals, 11, DOI:10.3390/cryst11010038
33. Mendes Diogo, Sousa David, Cerdeira Ana C., Pereira Laura C.J., Marques Ana, Murta-Pina João, Pronto Anabela, Ferreira Isabel. 2021.Low-cost and high-performance 3D printed YBCO superconductors, Ceramics International, 47, DOI:10.1016/j.ceramint.2020.08.143
34. Krauth Julian J., Schuhmann Karsten, Ahmed Marwan Abdou, Amaro Fernando D., Amaro Pedro, Biraben François, Chen Tzu-Ling, Covita Daniel S., Dax Andreas J., Diepold Marc, Fernandes Luis M. P., Franke Beatrice, Galtier Sandrine, Gouvea Andrea L., Götzfried Johannes, Graf Thomas, Hänsch Theodor W., Hartmann Jens, Hildebrandt Malte, Indelicato Paul, Julien Lucile, Kirch Klaus, Knecht Andreas, Liu Yi-Wei, Machado Jorge, Monteiro Cristina M. B., Mulhauser Françoise, Naar Boris, Nebel Tobias, Nez François, dos Santos Joaquim M. F., Santos José Paulo, Szabo Csilla I., Taqqu David, Veloso João F. C. A., Vogelsang Jan, Voss Andreas, Weichelt Birgit, Pohl Randolf, Antognini Aldo, Kottmann Franz. 2021.Measuring the α-particle charge radius with muonic helium-4 ions, Nature, 589, DOI:10.1038/s41586-021-03183-1
35. Bougoffa Amira, Benali A., Bejar M., Dhahri E., Graça M.P.F., Valente M.A., Bessais L., Costa B.O.F.. 2021.Mg-substitution effect on microstructure, dielectric relaxation and conduction phenomenon of Fe based perovskite nanomaterials, Journal of Alloys and Compounds, 856, DOI:10.1016/j.jallcom.2020.157425
36. Harizanova Ruzha, Bocker Christian, Avdeev Georgi, Slavov Stanislav, Costa Luis C., Avramova Ivalina, Rüssel Christian. 2021.Microstructure and electrical conduction of iron-doped barium titanate glass-ceramics, Journal of Non-Crystalline Solids, 560, DOI:10.1016/j.jnoncrysol.2021.120711
37. Vieira Joana, Paixão Tiago, Antunes Paulo, Facão Margarida, Rocha Ana M.. 2021.Modelling, fabrication and characterization of long period gratings inscribed by femtosecond laser, Optik, 229, DOI:10.1016/j.ijleo.2021.166283
38. Marciel Alice, Graça Manuel, Bastos Alexandre, Pereira Luiz, Suresh Kumar Jakka, Borges Joel, Vaz Filipe, Peres Marco, Magalhães Sergio, Lorenz Katharina, Silva Rui. 2021.Molybdenum Oxide Thin Films Grown on Flexible ITO-Coated PET Substrates, Materials, 14, DOI:10.3390/ma14040821
39. Teixeira Silvia Soreto, Graça Manuel P. F., Lucas José, Valente Manuel Almeida, Soares Paula I. P., Lança Maria Carmo, Vieira Tânia, Silva Jorge Carvalho, Borges João Paulo, Jinga Luiza-Izabela, Socol Gabriel, Mello Salgueiro Cristiane, Nunes José, Costa Luís C.. 2021.Nanostructured LiFe5O8 by a Biogenic Method for Applications from Electronics to Medicine, Nanomaterials, 11, DOI:10.3390/nano11010193
40. Ferreira Marta S., Bierlich Jörg, Kobelke Jens, Pinto João L., Wondraczek Katrin. 2021.Negative curvature hollow core fiber sensor for the measurement of strain and temperature, Optics Express, 29, DOI:10.1364/OE.412532