Помогите, пожалуйста, с статьей из J. Chem. Soc., Perkin Trans. 1
Michael K. Shepherd. Cyclobutarenes. Part 2. Azaquinomethanes as reactive intermediates: synthesis of cyclobutapyridine and cyclobutapyrazine derivatives. J. Chem. Soc., Perkin Trans. 1, 1986, 1495 - 1498