Linked from
The 27 pages that link to Quark model, each with the reason it gives.
PionRelated: It reinterpreted pions as quark–antiquark bound states.
Charm quarkRelated: It predicts hadron families containing charm alongside lighter quarks.
KaonRelated: It accounts for kaon charges and identifies their constituent quark–antiquark pairs.
Strange quarkRelated: The model assigned a strange constituent to the known strange hadrons.
PentaquarkRelated: Its extended configurations allow hadrons with four quarks and an antiquark.