Sentence examples for this lemma can be found from inspiring English sources

The proof of this lemma can be found in [11].

This lemma can be found in [11] or [12].

This lemma can be found in [25, 26].

The proof of this lemma can be found in [30, Theorem ].

Proof The proof of this lemma can be found in Wu [29] or Wang et al. [30].

if and only if b ∈ C ∗ and d ≤ 0, where C ∗ = { α : α ′ β ≤ 0, ∀ β ∈ C } is the dual cone of C. Proof This lemma can be found in [26].

The proof of the Lemma can be found in [15].

The proofs of these lemmas can be found in [21], Lemmas 3.1-3.3 3.1-3.3

The following lemma can be found in [1], Lemma 5.2.

The next lemma can be found in ([7], Lemma 4).

The following lemma can be found in [2].