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Krzysztof E. Krakowiak; Garren E. Maas; Jerald S. Bradshaw; Jon K. Hathaway; Reed M. Izatt. (1995). An improved one-step method to prepare some diaza-crown ethers and the cation complexation properties of 4,10-diaza-18-crown-6 with two transition metal ions. , 32(1), 179–181. doi:10.1002/jhet.5570320129 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research