found: Nigul, U. K. Nelineĭnye i lineĭnye perekhodnye volnovye prot︠s︡essy, 1972.
found: His Nelineĭnye volny deformat︠s︡ii, 1981:t.p. (I︠U︡. K. Ėngelʹbrekht) verso t.p. (I︠U︡riĭ Kustavich Ėngelʹbrekht)
found: His Nonlinear wave processes of deformation in solids, 1983:CIP t.p. (J. Engelbrecht)
found: Nonlinear waves--dynamics and evolution, c1989- :v. 1, CIP t.p. (J. Engelbrecht) data sheet (b. 8/1/39) verso t.p. (Professor Jüri Engelbrecht)
found: Nonlinear wave dynamics, 1997:CIP t.p. (Jüri Engelbrecht; Estonian Academy of Sciences, Tallinn, Estonia)
found: Eesti Teaduste Akadeemia website, March 15, 2019(Jüri Engelbrecht; born August 1, 1939 in Tallinn; professor emeritus, Tallinn Technical University; president of the Estonian Academy of Sciences (1994-2004); mechanics, mathematics, physics, nonlinear dynamics)
