Dear organizing committee: Jose-Luis Hervas-Oliver presented in Druid 2023 (Lisbon), a paper/poster called "RELATEDNESS AND DIVERSIFICATION IN INDUSTRIAL DISTRICTS: IS IT ABOUT EMBEDDED REGIONAL OR FIRM-LEVEL CAPABILITIES?" Paper ID: 69671 I'm a coauthor of the paper, and I would like to get a certificate of the paper being presented by Jose Luis Hervas-Oliver and showing the coauthors as the ANECA (spanish acreditation authority) requires it. Thanks in advance. Carles Boronat-Moll Universitat de València