The Unicamp website published a news about the article "Optimizing COVID-19 second-dose vaccine delays saves ICU admissions", by Paulo Silva, Claudia Alejandra Sagastizábal, Luís Gustavo Nonato, Tiago Pereira and Claudio Struchiner, which was published in the PNAS - Proceedings of the National Academy of Sciences.
See the news on this link, in addition to the reports below:
Bori Agency: Delta requires shorter interval between vaccine doses, study suggests
USP Journal: Delta variant may require shorter interval between vaccine doses