Fom the mid-1990s, Wojtusiak concentrated on the mountainous areas of South America, participating in or organising more than ten scientific expeditions into the Andes, which resulted in more than 100 scientific publications and descriptions of more than 400 new species of butterflies and moths, principally belonging to the Tortricidae family, in co-authorship with Professor Józef Razowski.
Józef Piłsudski | Józef Ignacy Kraszewski | Józef Simmler | Józef Poniatowski | Jozef Gabčík | Józef Michalik | Józef Andrzej Załuski | Józef Dominik | University of Pavol Jozef Šafárik | Józef Wybicki | Jozef Štafura | Józef Razowski | Józef Maria Hoene-Wroński | Józef Mackiewicz | Józef Kustroń | Jozef Israëls | Józef Dwernicki | Jozef Cleber | Józef Brudziński | Jozef Brudzinski | Józef Bem | Józef Zajączek | Józef Wojciechowski | Jozef Tomko | Józef Sowiński | Józef Potocki | Józef Pietrończyk | Józef Peszka | Józef Olszyna-Wilczyński | Jozef Murgaš |