TY - BOOK AU - Ovchinnikov Sergei G & Val'Kov Valery V TI - Hubbard Operators in the Theory of Strongly Correlated Electrons SN - 9781860945977 PB - ICP KW - Mathematics UR - https://www.worldscientific.com/worldscibooks/10.1142/p314#t=toc ER -