https://dds.las.ac.cn/service/document?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1763029728400&signature=8d71e5616dea9aeaed54d5ed9bb3a726&articleTitle=Quadrature+RC%E2%88%92Oscillators&articleAuthor=Jo%C3%A3o+Carlos+Ferreira+de+Almeida+Casaleiro%2C+Lu%C3%ADs+Augusto+Bica+Gomes+Oliveira%2C+Igor+M.+Filanovsky&publicationTitle=Quadrature+RC%E2%88%92Oscillators&language=&publicationType=1&publishYear=2019&isn=9783030007393&publisher=Springer+International+Publishing