“Language Whistling: a Comparison Between Silbo and Solresol Lingva Fajfado: Komparo Inter Silbo Kaj Solresol”. InKoj. Philosophy & Artificial Languages, New series 2, no. 1 (February 8, 2011): 61–71. Accessed July 27, 2026. https://test-ojs-unimi-it.archicoop.it/index.php/inkoj/article/view/840.