Geodesic
Representation of binary quadratic forms by a quaternary form
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 19, Tome 302 (2003), pp. 68-80 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper presents formulas for finding the number of representations $r(A;Q)$ of a form $A$ with odd square-free level by the form $Q$ defined by the identity matrix of order 4. The case where the difference of the dimensions $n-m$ is even (the codimension is even), which was not considered previously, is analyzed. 
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     author = {N. Yu. Kuranova},
     title = {Representation of binary quadratic forms by a~quaternary form},
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N. Yu. Kuranova. Representation of binary quadratic forms by a quaternary form. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 19, Tome 302 (2003), pp. 68-80. http://geodesic.mathdoc.fr/item/ZNSL_2003_302_a4/

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