BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@Booklet{EasyChair:8973,
author = {Maria Eugenia Lambertinez Rivera and Yeison Javier Fonseca Rojas and Ricardo Alonso Espinosa Medina},
title = {Design of Technical Support for Stand-up},
howpublished = {EasyChair Preprint no. 8973},
year = {EasyChair, 2022}}
