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We consider the model of minimally interacting electromagnetic, gravitational and massive scalar fields free of any additional nonlinearities. In the dimensionless form, the Lagranginan contains only one parameter γ=(mG/e)2 which corresponds to the ratio of gravitational and electromagnetic interactions and, for a typical elementary particle, is about 10−40 in value. However, regular (soliton-like) solutions can exist only for γ≠0, so that gravity would be necessary to form the structure of andoi:10.3390/universe6110193 fatcat:xcd2vhn2abglff67nzj57qycfy