diff --git a/Makefile b/Makefile
index 290ba60..86deb51 100644
--- a/Makefile
+++ b/Makefile
@@ -6,8 +6,7 @@ include _environment
 default: help
 
 render:
-	${JULIA} --project=@. -e 'import Pkg; Pkg.resolve(); Pkg.instantiate(); Pkg.precompile(); using QuantumToolbox, HierarchicalEOM;'
-	${JULIA} --project=@. -e 'using QuantumToolbox, HierarchicalEOM;'
+	${JULIA} --project=@. -e 'import Pkg; Pkg.resolve();'
 	${QUARTO} render
 
 preview:
diff --git a/QuantumToolbox.jl/lowrank.qmd b/QuantumToolbox.jl/lowrank.qmd
index 27e5cca..ef6ccf4 100644
--- a/QuantumToolbox.jl/lowrank.qmd
+++ b/QuantumToolbox.jl/lowrank.qmd
@@ -7,7 +7,7 @@ date-format: iso
 engine: julia
 ---
 
-In this tutorial, we will show how to solve the master equation using the low-rank method. For a detailed explanation of the method, we recommend to read the article: [Phys. Rev. Research 6, 023072 (2024)](https://doi.org/10.1103/PhysRevResearch.6.023072).
+In this tutorial, we will show how to solve the master equation using the low-rank method. For a detailed explanation of the method, we recommend to read the Ref. [@gravina2024adaptive].
 
 As a test, we will consider the dissipative Ising model with a transverse field. The Hamiltonian is given by
 
diff --git a/README.md b/README.md
index 0a02c0a..40bdde1 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,7 @@ make render
 or
 ```shell
 source _environment
-julia --project=@. -e 'import Pkg; Pkg.resolve(); Pkg.instantiate(); Pkg.precompile()'
-julia --project=@. -e 'using QuantumToolbox, HierarchicalEOM;'
+julia --project=@. -e 'import Pkg; Pkg.resolve();'
 quarto render
 ```
 
diff --git a/_environment b/_environment
index 388ce63..e71fdb6 100644
--- a/_environment
+++ b/_environment
@@ -1 +1 @@
-JULIA_NUM_THREADS=16
+JULIA_NUM_THREADS=4
diff --git a/_quarto.yml b/_quarto.yml
index 3f08198..82aafa2 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -24,6 +24,8 @@ website:
       - icon: github
         href:  https://github.com/qutip/qutip-julia-tutorials
 
+bibliography: bibliography.bib  
+
 format:
   html:
     theme:
diff --git a/bibliography.bib b/bibliography.bib
new file mode 100644
index 0000000..0ec9ddd
--- /dev/null
+++ b/bibliography.bib
@@ -0,0 +1,13 @@
+@article{gravina2024adaptive,
+  title = {{Adaptive variational low-rank dynamics for open quantum systems}},
+  author = {Gravina, Luca and Savona, Vincenzo},
+  journal = {Phys. Rev. Res.},
+  volume = {6},
+  issue = {2},
+  pages = {023072},
+  numpages = {18},
+  year = {2024},
+  month = {Apr},
+  publisher = {American Physical Society},
+  doi = {10.1103/PhysRevResearch.6.023072}
+}