• M. Lettieri, M. Masieri, M. Aquaro, D. Dilorenzo, M. Frigione: “Eco-friendly protective coating to extend the life of art-works and structures made in porous stone materials”. Coatings MDPI, Vol. 11(11), Article number 1270, page 1-18 (2021). DOI: 10.3390/coatings11111270 
  • M. Lettieri, M. Masieri, M. Frigione, “Novel Nano-filled Coatings for the Protection of Built Heritage Stone Surfaces”. Nanomaterials MDPI, Vol. 11(2), Article number 301, page 1-13 (2021). DOI: 10.3390/nano11020301
  • A. Rudawska, M. Frigione (in collaboration with Lublin University of Technology, Poland), “Cold-Cured Bisphenolic Epoxy Adhesive Filled with Low Amounts of CaCO3: Effect of the Filler on the Durability to Aqueous Environments”. Materials MDPI, Vol. 14(6), Article number 1324, 1-26 (2021). DOI: 10.3390/ma14061324
  • M. Frigione, G. Marini, M. Pinna, “A Thermal Analysis-Based Approach to Identify Different Waste Macroplastics in Beach Litter: The Case Study of Aquatina di Frigole NATURA 2000 Site (IT9150003, Italy)”. Sustainability MDPI, Vol. 13(6), Article number 3186, page 1-15 (2021). DOI: 10.3390/su13063186
  • A. Rodríguez-Prieto, E. Primera, M. Frigione, A.M. Camacho (in collaboration with UNED, Spain; SGS Tecnos, Spain; University of Delaware, USA), “Reliability Prediction of Acrylonitrile O-Ring for Nuclear Power Applications Based on Shore Hardness Measurements”. Polymers MDPI, Vol. 13(6), Article number 943, page 1-18 (2021). DOI: 10.3390/polym13060943
  • A. Rodríguez-Prieto, M. Frigione, J. Kickhofel, A.M. Camacho (in collaboration with UNED, Spain; SGS Tecnos, Spain; Apollo Plus, Switzerland), “Analysis of the technological evolution of materials requirements included in reactor pressure vessels manufacturing codes”. Sustainability MDPI, Vol. 13(10), Article number 5498, page 1-20 (2021). DOI: 10.3390/su13105498
  • A. Aragosa, V. Specchia, M. Frigione (in collaboration with Al Akhawayn University, Morocco), “Isolation of Two Bacterial Species from Argan Soil in Morocco Associated with Polyhydroxybutyrate (PHB) Accumulation: Current Potential and Future Prospects for the Bio-Based Polymer Production”. Polymers MDPI, Vol. 13(11), Article number 1870, page 1-14 (2021). DOI: 10.3390/polym13111870
  • M. Frigione, A. Rodríguez-Prieto (UNED, Spain; SGS Tecnos, Spain), “Can accelerated aging procedures predict the long term behavior of polymers exposed to different environments?”. Polymers MDPI, Vol. 13(16), Article number 2688, page 1-18 (2021). DOI: 10.3390/polym13162688
  • A. Aragosa, V. Specchia, M. Frigione (in collaboration with Al Akhawayn University, Morocco), “PHB Produced by Bacteria Present in the Argan Field Soil: A New Perspective for the Synthesis of the Bio-Based Polymer”. Proceedings, 69(1), 5, 1-7 (2021). ISSN 2504-3900. DOI: 10.3390/CGPM2020-07226