@article{Maria Johnson2015, author = "Irudayam Maria Johnson and Halan Prakash and Jeyaguru Prathiba and Raghavachary Raghunathan and Raghunathan Malathi", title = "{FTIR spectra of free methylxanthines in the region of 1400–400 cm−1.}", year = "2015", month = "12", url = "https://plos.figshare.com/articles/figure/_FTIR_spectra_of_free_methylxanthines_in_the_region_of_1400_400_cm_8722_1_/199688", doi = "10.1371/journal.pone.0050019.g003" }