Katona 2000, p. 84: "The time of the departure of the Proto-Greeks semel is mid EH II (2400/2300 B.C.) (L and A available). Their route between Ukraine and Greece can be supposed to have led through Rumania and East Balkans towards the Hebros-valley (North-Eastern Greece). Here they turned to the West (A available)." Katona, A. L. (2000). "Proto-Greeks and the Kurgan Theory"(PDF). The Journal of Indo-European Studies. 28 (1–2): 65–100.
Katona 2000, pp. 84–86: "Contacts must have existed, too, until 1900 B.C., when Western tribes lived in Epirus, Southwest Illyria and Western Macedonia, i.e. in the western neighborhood of the Ionians [...] The main body of the Proto-Greeks – as seen already in Sakellariou 1980 – had settled in southwest Illyria, Epirus, Western Macedonia, and northwestern Thessaly." Katona, A. L. (2000). "Proto-Greeks and the Kurgan Theory"(PDF). The Journal of Indo-European Studies. 28 (1–2): 65–100.
West 1997, p. 1: "[T]he majority view for the last twenty or thirty years has been that the arrival of the proto-Greek-speakers is signalled archaeologically by two waves of destruction which took place at various sites in central and southern Greece at the beginning and end of the Early Helladic III period. These waves seem now to be flattening out under critical scrutiny." West, M. L. (1997). The East Face of Helicon: West Asiatic Elements in Greek Poetry and Myth. Oxford: Clarendon Press. ISBN9780191591044.
Georgiev 1981, p. 156: "The Proto-Greek region included Epirus, approximately up to Αὐλών in the north including Paravaia, Tymphaia, Athamania, Dolopia, Amphilochia, and Acarnania), west and north Thessaly (Hestiaiotis, Perrhaibia, Tripolis, and Pieria), i. e. more or less the territory of contemporary northwestern Greece)." Georgiev, Vladimir Ivanov (1981). Introduction to the History of the Indo-European Languages. Sofia: Bulgarian Academy of Sciences. ISBN9789535172611.
Heggarty et al. 2023, "A DensiTree showing the probability distribution of tree topologies for the Indo-European language family." Heggarty, Paul; Anderson, Cormac; Scarborough, Matthew; King, Benedict; Bouckaert, Remco; Josz, Lechoslaw; Kümmel, Martin Joachim; Jügel, Thomas; Irslinger, Britta; Pooth, Roland; Liljegren, Henrik; Strand, Richard F.; Haig, Geoffrey; Macák, Martin; Kim, Ronald I.; Anonby, Erik; Pronk, Tijmen; Belyaev, Oleg; Dewey-Findell, Tonya Kim; Boutilier, Matthew; Freiberg, Cassandra; Tegethoff, Robert; Serangeli, Matilde; Liosis, Nikos; Stroński, Krzysztof; Schulte, Kim; Gupta, Ganesh Kumar; Haak, Wolfgang; Krause, Johannes; Atkinson, Quentin D.; Greenhill, Simon J.; Kühnert, Denise; Gray, Russell D. (2023). "Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languages". Science. 381 (6656). doi:10.1126/science.abg0818. hdl:10234/204329.
Dickinson 1999, pp. 97–107. Dickinson, Oliver (December 1999). "Invasion, Migration and the Shaft Graves". Bulletin of the Institute of Classical Studies. 43 (1): 97–107. doi:10.1111/j.2041-5370.1999.tb00480.x.
Heggarty et al. 2023, "A DensiTree showing the probability distribution of tree topologies for the Indo-European language family." Heggarty, Paul; Anderson, Cormac; Scarborough, Matthew; King, Benedict; Bouckaert, Remco; Josz, Lechoslaw; Kümmel, Martin Joachim; Jügel, Thomas; Irslinger, Britta; Pooth, Roland; Liljegren, Henrik; Strand, Richard F.; Haig, Geoffrey; Macák, Martin; Kim, Ronald I.; Anonby, Erik; Pronk, Tijmen; Belyaev, Oleg; Dewey-Findell, Tonya Kim; Boutilier, Matthew; Freiberg, Cassandra; Tegethoff, Robert; Serangeli, Matilde; Liosis, Nikos; Stroński, Krzysztof; Schulte, Kim; Gupta, Ganesh Kumar; Haak, Wolfgang; Krause, Johannes; Atkinson, Quentin D.; Greenhill, Simon J.; Kühnert, Denise; Gray, Russell D. (2023). "Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languages". Science. 381 (6656). doi:10.1126/science.abg0818. hdl:10234/204329.
Heggarty et al. 2023, "A DensiTree showing the probability distribution of tree topologies for the Indo-European language family." Heggarty, Paul; Anderson, Cormac; Scarborough, Matthew; King, Benedict; Bouckaert, Remco; Josz, Lechoslaw; Kümmel, Martin Joachim; Jügel, Thomas; Irslinger, Britta; Pooth, Roland; Liljegren, Henrik; Strand, Richard F.; Haig, Geoffrey; Macák, Martin; Kim, Ronald I.; Anonby, Erik; Pronk, Tijmen; Belyaev, Oleg; Dewey-Findell, Tonya Kim; Boutilier, Matthew; Freiberg, Cassandra; Tegethoff, Robert; Serangeli, Matilde; Liosis, Nikos; Stroński, Krzysztof; Schulte, Kim; Gupta, Ganesh Kumar; Haak, Wolfgang; Krause, Johannes; Atkinson, Quentin D.; Greenhill, Simon J.; Kühnert, Denise; Gray, Russell D. (2023). "Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languages". Science. 381 (6656). doi:10.1126/science.abg0818. hdl:10234/204329.