VerezhakA. P., Horodets’kyiV. V., and PetryshynR. I. 2018. “A Problem for One Class of pseudodifferential evolutionary Equations Multipoint in the Time Variable”. Ukrains’kyi Matematychnyi Zhurnal 70 (3), 337-55. http://umj.imath.kiev.ua/index.php/umj/article/view/1560.