547 tao2012 pdf cache all wpfb_file_category citations 1570453816 9e1211efce96992c9c0665b222e479be a9f688434ffc827a0fa0e886f881ef5394809384589bffa0af57ec6cb430030e compact and portable open path sensor for simultaneous measurements of atmospheric n2o co using a quantum cascade laser 2019 10 07 16 30 18 0 93 158 76 2020 01 02 15 56 25 draft release sample pdf application num_pages analyze pdf_pages pdf_2text timings