On endomorphisms of groups of order 32 with maximal subgroups C4 x C2 x C2Puusemp, Piret; Puusemp, PeeterProceedings of the Estonian Academy of Sciences2014 / p. 105-120 https://artiklid.elnet.ee/record=b2673949*est

On endomorphisms of groups of order 32 with maximal subgroups C8 x C2Puusemp, Piret; Puusemp, PeeterProceedings of the Estonian Academy of Sciences2014 / p. 355-371

On endomorphisms of groups of order 32 with maximal subgroups C24 or C42Puusemp, Piret; Puusemp, PeeterProceedings of the Estonian Academy of Sciences2016 / p. 1-14 http://dx.doi.org/10.3176/proc.2016.1.04

On endomorphisms of groups of order 36Leibak, Alar; Puusemp, PeeterProceedings of the Estonian Academy of Sciences2016 / p. 237-254 http://dx.doi.org/10.3176/proc.2016.3.06

On the endomorphism semigroup of a multiple wreath product of groupsPuusemp, PeeterCommunications in algebra2017 / p. 247-261 http://dx.doi.org/10.1080/00927872.2016.1206340