CYCLIZATION OF THE SUBSTITUTED N-(ORTHO-CYCLOPROPYLPHENYL)-N′-ARYL UREAS AND THIOUREAS IN THE GAS PHASE AND SOLUTION Article Lobodin V.V., Fedotov A.N., Dem'yanov P.I., Lebedev A.T., Ovcharenko V.V., Pihlaja K., Blumenthal T. Journal of The American Society for Mass Spectrometry. Elsevier Science Publishing Company, Inc.. Vol. 16. 2005. P. 1739-1749