Geodesic
Statement of border tasks on the plane dependent on the coefficients for the type of the wave equation.~II
Trudy Instituta matematiki, Tome 27 (2019) no. 1, pp. 37-43.

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This article by the content and title is an extension of [1]. In the half-strip we consider problems for the equation, which is presented in [1]. Here one of its coefficients is zero. In this case the operator of the equation represents the composition of two first-order operators. The corresponding boundary conditions are added to the equation under consideration to obtain the correct problems. 
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V. I. Korzyuk; I. S. Kozlovskaja; S. N. Naumavets. Statement of border tasks on the plane dependent on the coefficients for the type of the wave equation.~II. Trudy Instituta matematiki, Tome 27 (2019) no. 1, pp. 37-43. http://geodesic.mathdoc.fr/item/TIMB_2019_27_1_a4/

[1] Korzyuk V. I., Kozlovskaya I. S., Naumovets S.N., “Postanovka granichnykh zadach na ploskosti v zavisimosti ot koeffitsientov dlya tipa volnovogo uravneniya. I”, Trudy Instituta matematiki, 27:1 (2019), 29–36

[2] Korzyuk V. I., Kozlovskaya I. S., Klassicheskie resheniya zadach dlya giperbolicheskikh uravnenii, V desyati chastyakh, v. 1, Minsk, 2017, 45 pp.

[3] Korzyuk V. I., Kozlovskaya I. S., Klassicheskie resheniya zadach dlya giperbolicheskikh uravnenii, V desyati chastyakh, v. 2, Minsk, 2017, 52 pp.