Design of simple valve spring compressor for maintenance of the cylinder head of tugboat engine. Proceedings Series of Borobudur International Symposium on Energy and Engineering, [S. l.], v. 1, p. V124007, 2024. DOI: 10.31603/biseeng.29. Disponível em: https://unimma.press/conference/index.php/biseeng/article/view/29. Acesso em: 10 jan. 2025.