ELECTRONIC STRUCTURE, IONIC EQUILIBRIA AND COMPLEX FORMATION OF SOME DERIVATIVES OF 1-PHENYL-3-METHYLPYRAZOLONE-5 Article Kovalchukova O.V., Volyanskiy O.V., Strashnov P.V., Korolev O.V., Strashnova S.B., Epiphanova T.A. Бутлеровские сообщения. Vol. 24. 2011. P. 84-89