Qiao, Y., Lu, Y., Chen, W., Baumgarten, M., & Zhou, G. (2019). Cyclopenta[b]thiopyran and cyclopenta[b]selenopyran based heteroarenes: electronic communication between S- and/or Se-fused aromatics. Chemical Communications, 55(35), 5107-5110. doi:10.1039/c9cc01761e.