alpha-times Integrated Semigroups (alpha in R-) Milorad Mijatović; Stevan Pilipović — 1997 Matematički Vesnik
Integrated semigroups of unbounded linear operators and C 0 -semigroups on subspaces. Kravarušić, Ratko; Mijatović, Milorad; Pilipović, Stevan — 2002 Matematichki Vesnik
Integrated semigroups of unbounded linear operators -- Cauchy problem. II. Kravarušić, Ratko; Mijatović, Milorad; Pilipović, Stevan — 1998 Novi Sad Journal of Mathematics