https://www.youtube.com/watch?v=vIT4ra6Mo0shttps://www.newtoncbraga.com.br/https://shop.ipc.org/general-electronics/standards/a610-0-h-englishhttps://en.wikipedia.org/wiki/Restriction_of_Hazardous_Substances_Directivehttp://www.pcbcart.com/article/content/contrast-on-soldering-technologies.htmlhttps://www.raisa.com.br/ponteira-de-solda-cuidadohttps://www.embarcados.com.br/webinar-uma-visao-geral-sobre-projeto-de-pcb-nos-tempos-atuais/