Observational evidence of activity in galaxies : proceedings of the 121st Symposium of the International Astronomical Union, held in Byurakan, Armenia, U.S.S.R., June 3-7, 1986 / ed. by E.Ye. Khachikian, K.J. Fricke and J. MelnickBroad emission line profiles in active galactic nuclei / Giovanna Maria StirpeChemical fingerprints of star forming regions and active galaxies / Juan Pablo Pérez BeaupuitsChemical fingerprints of star forming regions and active galaxies / Juan Pablo Pérez BeaupuitsThe Seyfert galaxy population : a radio survey; luminosity functions; related objects / Evert Johan Alexander Meurs